Ozone Generators for Spas

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Using an ozonator, to improve spa or swim-spa water quality!!!

Ozone generators can be very useful in maintaining spa and swim-spa water quality, but they cannot be the only product being used to sanitize and maintain the water.  Ozone leaves the water very quickly, once the ozonator is turned off.  This requires that a persistent sanitizer, such as chlorine or bromine be present.  Sanitizing is a must, for proper spa water management.  Salt Chlorine generators are a better way to utilize chlorine, producing more controllable results. They eliminate the need to handle, measure or store chlorine products, while reducing buildup problems.  An Electronic  PockeTester Kit is a convenient way to monitor the salt level.

Salt Chlorine Generators - 4 Models Testing The Salt Level Salt Chlorine Generators - 4 Models Product and Ordering Information Product and Ordering Information Product and Ordering Information If you have a pool or spa water testing need, we should have the product.  ► Scroll down to read through some Question & Answer information. ◄ A ColorQ 2X is a 2nd generation, Bluetooth, Waterproof, all-digital tester, that can measure all the common test factors. There is a model, for every sanitizing need.  An Automatic Filter Cartridge Cleaner will save time and effort and get your filter cartridge, cleaner than ever.  The WaterLink SpinTouch Labs are the ultimate tester, doing up to 10 different water test factors, in just 1 minute. ColorQ All-Digital Water Testers Automatic Filter Cartridge Cleaner WaterLink SpinTouch Labs The ColorQ 2X line of all-digital testers which are Bluetooth and Waterproof, use a photometer to test and measure combinations of up to 11 different pool and spa water parameters, including Free and Total Chlorine, Bromine, pH, Total Alkalinity, Calcium Hardness, Cyanuric Acid, Iron, Copper, Biguanide and Biguanide Shock. Simple and easy to use, with models for every need, whether for home or professional use.  Instructions are diagrammatic and trilingual. The individual testers use either liquid or tablet reagents.  Better control of the water chemistry helps control all aspects of pool or spa water quality and sanitation. Good spa maintenance demands a clean filter and filter cartridge cleaning has never been easier or more effective.  Simple attach a garden hose, to the Blaster, and place the pool or spa filter cartridge on top of the rollers.  Turn the water on and the rollers start to rotate the filter cartridge.  As it rotates, a series of powerful water jets clean, within the pleats, and wash the dirt away.  A cleaner filter cartridge in less time and the opportunity for better water quality too. It's all done, in just a few minutes.  Suitable for use with Ceramic Spa Filters, with at least a 6-inch (15 cm) diameter.  Great for the Home Owner, Professional or Aquatic Facility. The WaterLink SpinTouch Lab are the most advanced testers ever introduced, in the pool and spa industry. They are the result of 7 years of R & D. Using a single 3-ml sample of water, you can perform up to 10 different tests, in just one minute, with the press of a button. Tests include: Free and Total Chlorine, Bromine, pH, Total Alkalinity, Calcium Hardness, Cyanuric Acid, Iron, Copper, Biguanide, Biguanide Shock, Borates, Phosphates and Salt. Four models for In-Store, Mobile, Commercial or Drinking water use. Read test results on the TouchScreen, send them to a computer, a tablet or to the Cloud. So Easy!!! So fast!!! So Precise!!! Product and Ordering Information Product and Ordering Information Product and Ordering Information If you have a pool or spa water testing need, we should have the product.  ► Scroll down to read through some Question & Answer information. ◄

How to use an ozonator, to help sanitize a spa?

 Ozone (O3) is a form of oxygen (O2) and is a very strong oxidizing agent that can help control microorganisms, destroy organic contamination, unwanted byproducts, dead algae and organic debris. It is not a complete spa or hot tub sanitizer, in the truest sense, because ozone does not remain in water for long periods of time. In a spa or hot tub, there must be a backup sanitizer such as, chlorine or bromine, usually at about 1/2 the normal level. Because the ozonator does most of the oxidizing, an Ozonator, also known as an Ozone Generator, will reduce the quantity of the backup sanitizer required for proper sanitation. This is especially important in larger heavy bather usage situations. The devices that generate Ozone fall into two categories: UV or Corona discharge. Commercial spas and other high bather usage installations should utilize a unit, as it is sized to be capable of producing the greater quantities of ozone, that these situations require. With ozonation, the water chemistry should be maintained in the typical manner. Ozone generators can be even more effective, when used together with a salt chlorine generator.  If problems arise, refer to the Spa Problems Page, as a source of problem-solving information, broken down into various categories.  Scroll down the page and click on the linked keywords, catch phrases or images, in the archived answers below, to access additional information, on that topic or product.

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► Ozone Needs Some Help?

Hello Alan, I just discovered your website and am thrilled. My husband and I just purchased a spa, about a month ago. We were told that maintaining the spa was easy But we are having a very difficult time. Our water has been cloudy from day one and we have been unable to find any clear direction on how to maintain it. Help, please!

Dee N, 9/8/2018

Two things must be done. Proper sanitation and the correct chemistry. And you must filter the spa, for at least several hours a day. A salt chlorine generator and a ColorQ digital tester can help you achieve better sanitation and chemistry.  Salt chlorine generators have a tendency to raise the pH, as chlorine is being formed. This has the benefit of avoiding low pH conditions that might, otherwise, allow chlorine to cause corrosion of copper heater parts. The ChlorMaker Salt Chlorine Generator was designed for spas up to 1000 gallons and swim spas up to 2000 gallons. Other models treat up to 1000 gallons and require no installation.  Some are smart enough, to only produce chlorine, when it is actually needed, so you'll never overchlorinate again.  They can be used with either 110 or 220 Volts and uses less than 0.5 amps.  For help with chemistry go to this page: calculating chemical additions. You have to maintain proper chemistry and the directions on the label may not work in all cases. Based on usage, your spa could require more or less.  I hope that this will be helpful.

Sincerely.  Alan Schuster, 9/8/2018

Thank you for your reply, Alan. Even though our spa has an ozonator, we should add a salt chlorine generator? Why wasn't that mentioned at time of purchase? Also, clarifier came in the start up kit but we were told that we didn't need it. They said that all we needed to do was run the filter, use test strips and use the one shock tablet. So frustrating!

Dee N., 9/9/2020

No spa ozonator manufacturer claims that all you need is an ozone generator. NONE! ZERO! He may have tried not to pump up the sale, out of fear of losing it, or was plain ignorant of the facts. The ozone concentration drops to zero, within minutes, once the unit is off. Ozone generators are great, but they need to be used with a persistent sanitizer. It is hard to measure ozone and if the unit fails, you won't know, until things get gross. If you use a low level of chlorine, its presence indicates that all is well, so long as it only requires minimal amounts of chlorine to maintain 1-3 PPM of free chlorine. A salt chlorine generator is an ideal complement. By allowing the ozonator to do most of the oxidation, the salt chlorine generator can be operated at a low setting. This makes pH control easier and extends the life of the salt cell. The chlorine is available to do the sanitizing and there should be no appreciable chlorine odor, because the ozone will destroy any odorous forms of chlorine. Chlorine gives you something to test and measure. While you could use a mineral sanitizer or bromine, a salt chlorine generator provides the means to maintain a satisfactory level of a persistent sanitizer. You don't have any way of testing for ozone, do you?  We offer several affordably priced, no-installation required salt chlorine generators. Just add a few pounds of salt and it is Plug and Play ready. They include timers and operate independently of the spa pump. I don't know what is in that "shock" tablet, but it obviously was not enough.  There is nothing wrong with adding a clarifier on a weekly basis or as needed. Spa filters are not super efficient and can use some help. Test strips are not bad, but if you are uncomfortable trying to match shades of colors, then you should consider a ColorQ 2X all-digital water analyzer, which eliminates all the color-matching and guesswork.  I hope that this has been helpful.

Sincerely.  Alan Schuster, 9/9/2020
 

► What Is Ozone?

My wife and I have been looking at hot tubs. Some of them seem to come equipped with an ozone device or offer it as an option. How does this work? Is it worth getting?

M & L, Rutherford, CA, 11/29/2014

Ozone is a highly reactive form of oxygen. Ozone (O3) contains 3 atoms of oxygen. The oxygen (O2) we breathe contains 2 atoms. It is this third atom of oxygen that allows ozone to oxidize or destroy organic wastes and contamination, bacteria, algae, etc. in spa or hot tub water. It is effective, even at very low levels. The only limitation is that once produced it quickly leaves the water. If ozone is not continuously produced, there will be periods where there may be little sanitizer present. For this reason, in spas and hot tubs, ozone is used in conjunction with a backup sanitizer, such as chlorine, bromine, salt chlorine generator, mineral sanitizers or ionization. A salt chlorine generator should be the best choice, in the long run.  In spas and hot tubs, ozone can be introduced in the water with the use of a device called an Ozone Generator or Ozonator. The use of ozone will not eliminate the need to add other chemicals or maintain proper water chemistry, but it will reduce the amount of chemicals required and should simplify maintenance. It's worth having! I hope that I have been helpful. Good luck with your choice.

Sincerely. Alan Schuster, 11/29/2014


► Ozone And Bromine In A Spa?

I am a new spa owner of 4 months. We have a spa with an ozonator and treat it with bromine. I run the ozonator about 4 hrs twice a day. I had problems with a rash using chlorine and find the bromine is also a problem, no one else in my family has any trouble. My question is I can not keep the bromine level down, we live in the northern states so it is covered a high percentage of the time now in winter. It can stay up around 10 plus on test strips after 15 seconds. Is there anything that can be done to lower bromine levels?

Rick L., 12/15/2017

Ozone generators can do a very effective job of removing organic wastes and byproducts that would. otherwise, react with the bromine. While it necessary for ozonation to use a backup sanitizer, such as bromine, the amount required should be considerably less. You can instantly lower the bromine levels by adding a small amount, as per label directions, of a chlorine neutralizer. This product is only intended as a solution for an occasional overdose and not as part of routine treatment. Once the bromine level has been reduced - you will probably only need 1-3 PPM as opposed to 3.5 PPM - cut back on the amount of bromine being used. Inasmuch as you are the only one suffering from a rash, you might be sensitive to chlorine and bromine in the hot water application. You can reduce the chlorine and bromine levels dramatically, by supplementing the ozonator with a mineral sanitizer or ionization unit. This will provide the necessary backup sanitation, for those periods when ozone is not being produced or many not be available. Some mineral sanitizers cannot be used in water that contains bromides.   I hope that this information will prove helpful. Enjoy the holidays.

Sincerely. Alan Schuster, 12/16/2017
 

► Using A Salt Chlorine Generator With An Ozonator?

Is it ok to use an ozonator with a ACE Salt chlorine generator? I bought a new Hot springs Spa with the optional salt system and it initially came with an Ozonator that was removed because they said I wouldn't need it and can't use it with the salt system.  Thanks.

Tom, 1/6/2017

You can use them together. With the ozonator providing oxidation, you will be able to operate the salt chlorine generator at a lower setting, to maintain any given level of free chlorine. This will help[ prolong the life of the salt cell and make pH control easier. I hope that this is helpful.

Sincerely.  Alan Schuster, 1/6/2017


► Getting The Spa Set Up?

Great web site Alan. I am in the process of setting up a spa (approx 450 gal). I will be installing an ozonator and probably using a mineral purifier. I would like to minimize bromine and chlorine, and minimize maintenance. Can you recommend a top of the line ozonator? Secondly, are there any other devices I can install that will automatically balance the water, so maintenance is reduced? Lastly, can you recommend which chemicals would be best suited, both type and brand. Thanks again.

Steven, 4/20/2011

An ozone generator will provide the oxidation required to destroy organic wastes.  Once the pump is off, the ozone quickly leaves the water, so it needs to be used with some more persistent sanitizers.  The use of a mineral sanitizer will add a backup sanitizer and should help you to greatly reduce chlorine or bromine usage.  In addition, this combination will minimize the frequency of pH and total alkalinity adjustments. Having the water tested and balanced, will get you off on the right foot. Thereafter, some periodic adjustments will have to be made, based upon the usage patterns of your spa and the nature of your source water. There is nothing that will automatically balance the water - at least nothing that you should get involved with. I hope that I have been of assistance. Thanks for visiting the website and enjoy the spa.

Sincerely. Alan Schuster, 4/21/2011

► Ozone Or No Ozone?

Hello, hopefully you might be able to help me. I have a question about Ozonators. I am buying a spa and it has been recommended that I do not need an ozonator, The dealer also mentioned with a 1 year old child that might be in the spa with us, it is not recommended. It seems everyone recommends getting one? I have a friend who told me he lowers the temp of his spa in the summer time and says he has to have an ozonator in order to keep it clean. I haven't read anything to support that theory. What are your thoughts, should I invest the extra $200 bucks or not. Thanks for any feed back.

Mike, 8/30/2008

This is almost a no brainer. I can't think of a reason for you not to put in an ozone purification system, aside from the fact that you don't want ozone being produced while the bathers, especially children, are using the spa. The ozonator should shut off, if the pump is switched to high speed. The ozonator will go a long way towards maintaining optimum water quality. It is worth the extra money and will pay for itself in terms of reduced chemical usage. However, it is not all that you need to maintain water quality.  It leaves the water very quickly, so a persistent sanitizer, such as a salt chlorine generator, is needed to provide optimum sanitation and more control over the water quality.  When an ozonator is in use, the salt chlorine generator can be set to a lower output.  I hope that I have been helpful.

Sincerely. Alan Schuster, 8/30/2008


► Drain And Fill?

Hello Alan! G. B. the dj here! The wife and I just traded one top of the line spa for another top of the line spa, And boy do we love it. We now have 500 gallons of beautiful city water in our new tub and it costs us 50 cents to fill'er up. For 4 years I struggled with water issues with bromine and biguanide; never really happy with our water clarity (OR LACK OF). Now for my question? Can I forget most of the chemical stuff and simply drain all or part of the water each week and not damage the spa or the wife? We use our tub 4 or 5 times a week and LOVE IT. Thanks, dude.

G. B., 1/24/2005

We certainly don't want to "damage" the wife! Many high end spas come with an salt chlorine generator or ozone generator. Newer units probably have the ozonator on a separate low speed pump and this allows for better performance, as ozonation takes place throughout the day. Biguanide has a tendency to foam and this can interfere with the action of the ozonator. In addition, biguanide, after a period of time, can result in the formation of resistant microorganisms and lead to unsatisfactory conditions. Chlorine and ozone usually work well together. Now for your question. The practice of "drain and fill" is only practical for jetted tubs that have a relatively small volume of water. Using your spa, in this manner, will turn the water into old bath water within a few days, at most. The conditions will get progressively worse and could "damage" yourself and the wife. I suggest that you go with a salt chlorine generator and an ozonator. We offer several no installation required models and two of them are smart enough to only product chlorine, when it is actually needed, so you'll never over-chlorinate again. Test the water regularly and there should be few problems. I hope that I have been helpful and that you keep loving the spa.

Sincerely. Alan Schuster, 1/25/2005
 

► Knows What Works?

I just happened to run across your website and can't believe all the information you have. Great site! Thanks! 10 years ago, I bought a new hot tub (350 gal) and it was a horrible experience getting the water right. It was green, it was milky, just about everything others have described in their e-mails. I must have changed the water 3 times before I just stopped putting all those chemicals that the store got me to buy, $150.00 worth. My water is so clear, no foaming, just right. I have an ozonator and I have to assume it still works for the only thing I put in my water is a little shock once in a while and clean the filter. Well, I'm ready for a new one, one with more jets and I fear I will have the same experience I had 10 years ago. The hot tub manufacturer suggests I DON'T get an ozonator. I called the store this morning and requested one be installed anyway after reading all your problems folks have here on your site. When I explained to the store how old my tub is and how maintenance free it has been, they just said I was very lucky. Can you give me any advise on making the installation of my new hot tub a good experience? Thanks again and I have given so many people this website.

Gloria V., 6/6/2016

Yes. Have an ozone generator installed. Preferably one that uses a second pump and can run 24/7. That way all you should need is a periodic addition of chlorine or shock treatment. To be on the safe side, try and keep a free chlorine level of about 1 PPM. It should take very little chlorine because of the ozonator.  But, you already know this! You know what works for you, so why change? You might consider adding a salt chlorine generator, as it will eliminate the measuring, handling and storage of chlorine products. It adds persistent sanitizing action, which is lacking after the ozone leaves the water. Good luck and enjoy the new spa.

Sincerely. Alan Schuster, 6/6/2016


► How Much Ozone Is Enough?

Thanks for your awesome website! It's a great source of information. I recently started using a silver ion purifier with my hot tub ozonator. As per the manufacturer of the ion purifier, I've been adding shock with each use. However, I'm having some turbidity issues. My pH and alkalinity are within the recommended limits. Do you have any thoughts on this? In addition, how do I know that my ozonator is working? What is a typical ozone concentration in water that my ozonator should be maintaining in order to be effective? I'm considering purchasing a LaMotte test kit to monitor the ozone levels. Any information you can provide will be appreciated. Thanks.

Cathy, 3/18/2015

Ozone functions at very low levels and does not remain in the water for long periods of time. It is best to operate the ozonator for period throughout the day, instead of a single long run. I suggest 3 or 4, 2-hour sessions spaced apart. Ozonators must be used with persistent sanitizers, such as chlorine or bromine. Ozonators do not necessarily have to be used with shock, although a salt chlorine generator will do that, with the flick of a dial.  Ozone concentrations are low, just a few hundredths of a PPM. You might be able to smell it, when the cover is removed.  There is no ready explanation for your turbid water, other than inadequate oxidation or filtration. Try maintaining a low level of chlorine, about 1 PPM. With an ozonator functioning it should require little chlorine. If that is not the case, the ozonator might not be being used properly or outputting enough ozone. I hope that you will find the information helpful and thanks for your kind comments.

Sincerely. Alan Schuster, 3/18/2015


► Difference Of Opinion?

My wife and I recently purchased a spa. We have been thinking about adding a ozonator. Our spa only has one pump for filtering and jets. Would we be wasting our time buying a ozonator? We have heard so many different stories from different spa dealers. Some say that we wouldn't be gaining much without a separate circulating pump. I would like your comment on the subject. Thanks!
        
Curt H., 2/28/2010

It is true that many higher end spas have a separate low speed pump just for the ozonator. This allow ozone to be produced throughout the day. Since ozone doesn't remain in the water for extended periods of time, this is clearly the better way to ozonate. Not all spas are equipped with two pumps, but can still benefit from the improved water quality, an ozonator can produce. All that is required is for the timer to be set, so that the ozonator operates for 4 2-hour periods, spaced throughout the day. That way the spa is never more than a few hours from ozonation.  This is not something inflexible and individual requirements should allow for differences. But, the theory is the same: ozonate for periods spread out during the day and not in a single continuous run. In either case, a backup sanitizer, such as a salt chlorine generator, chlorine or bromine, should be employed. An ozonator will help enhance your spa experience and make water quality simpler and more consistent. Go for it and enjoy the spa.

Sincerely. Alan Schuster, 2/28/2010
 

► Sensitive To Spa Water?

I wrote to you earlier this year about a problem I am having with my spa. I will review the problem. Two years ago I installed a spa. My wife and I enjoyed its use almost very night for about three months. Then my wife started to get an itch that would not go away. She went to her doctor and then to a dermatologist. He said my wife had eczema and advised her to have a warm bath after using the hot tub and he prescribed some creams. My wife is 68 years old and has never had skin problems so I had some doubts about his findings. She continued to use the hot tub about once a week but the itchiness continued. So early this year I thought that I would change from bromine to chlorine and sought your advice on the change over. I have been using chlorine for about six months and there is no improvement in her condition. I still suspect that my wife is sensitive to some chemical in the hot tub. I substituted baking soda for the alkalinity control and now am wondering if it is the chemical causing the itchiness. Would you please comment on this? If you think it could be the problem, should I empty my spa and start with a store bought alkalinity agent? Thank you for your help.

Nelson D., Oberon, AR, 8/1/2009

I doubt that the baking soda is part of the problem. It is amongst the most innocuous of chemicals. Bromine contributes certain byproducts to the water and if you did not drain the spa before switching, I suggest that you do so at this time. Otherwise, even though you are adding chlorine, it is being converted to bromine. My best suggestion are that you get an Ozonator installed (unless the spa came with one already installed). This will allow you to use far less chemicals to maintain sanitation. In fact, you could use the Ozonator, in conjunction with a Mineral Sanitizer and be close to chlorine and bromine free.

Sincerely. Alan Schuster 8/2/2009


► Hydrogen Peroxide?

We have a hot tub and would like to use hydrogen peroxide instead of the normal chemicals. My husband is allergic to the chlorine and bromides. How much Hydrogen peroxide do we use and what %. We were told that it should be a 10% concentration but we can't find any hydrogen peroxide above 3%. I thought maybe you could help us. Also do we nee to use any kind of a shock at the first? Hope you can help!  Thanks.

Jo, 7/10/2005

I am not sure that using just hydrogen peroxide will provide adequate sanitation. In pools and spas, it is used as a shock treatment with biguanide. It is available in concentrated form in many pool and spa outlets that offer biguanide products. Have you considered the use of an ozone generator and a mineral sanitizer or ionizer. This combination would come close to being chlorine and bromine free. The ozonator could negate the need for hydrogen peroxide and a mineral sanitizer or ionizer would release metallic ions and act as a persistent sanitizer. Hydrogen peroxide can be used as a shock treatment and a mineral sanitizer or ionizer as the primary water sanitizer. However, in most cases better results are obtained, if you maintain a lower level of chlorine or bromine.  I hope that I've been helpful and given you some food for thought. Good luck with your decision.

Sincerely. Alan Schuster, 7/10/2005


► To Backup Or Not To Backup?

Alan, I appreciate your website and the info you present on spa maintenance. It has been most helpful to myself, a new spa owner  in Minnesota. My question is this: I have purchased a new spa with an advanced water management system that has a continual low speed circulating pump ozonator with no down time. In addition, I run the circulating pump of the spa 4 cycles a day for 1 hour. In reading your responses to questions regarding ozonators you are concerned with a back up sanitizer for down time. If my spa has no down time how important is a backup sanitizer such as chlorine or bromine? My other question-how necessary is shocking with chlorine after each use or on a weekly basis as you recommend with the continual ozonator my spa has? I look forward to your response. Thanks for your time regarding these concerns. Sincerely.

Keith R., 8/25/2008

Good questions. If ozone is being produced continuously, the need for a backup sanitizer is diminished, but not eliminated. It is probably not a clear cut case of not being needed. More likely it is a case of being safe or being even safer. Depending upon bather load and other factors, a backup sanitizer is still a good idea. These same factors can determine whether, or not, periodic shocking is required. The purpose of the periodic treatment is to prevent the development of resistant microorganisms and not just to deal with bather wastes. You could probably do without the shock treatment, but it would be safer to do it once a month or a first signs of a loss of water quality. Adding small amounts of chlorine or bromine and being able to measure them, helps provide persistent sanitation.  If all that is needed is a small amount of chlorine or bromine, it helps confirm that the ozonator output is optimum. I hope that I have been helpful.

Sincerely. Alan Schuster, 8/25/2008


► Backup Spa Sanitizer Choice?

I just received a 200 gallon spa from our relatives about 5 years old. I plan on using bromine along with an ozonator. The question I have is the manufacturer recommend the use of lithium hypochlorite with the ozonator. They say a part cupful can be added by hand as needed. I am not sure of this, as bromine and lithium hypo are two different chemicals. I think they mean to use Lithium Hypo solely along with the ozonator. Could you please clarify this for me?

Bob, 8/11/2005

For proper sanitation, an ozonator should be used with a persistent sanitizer, such as bromine or chlorine. Bromine is very popular in this application. It can be added in a variety of ways and is essentially odorless. Lithium hypochlorite is less popular, even amongst chlorine types, and can produce some chlorine-related odors. I would use bromine on a regular basis, along with the ozonator. You could use the lithium hypochlorite, as a shock treatment to quickly boost the bromine level, as it will convert to bromine in a bromine-maintained spa. The choice is yours. I think the manufacturer was merely trying to make sure that you used a backup sanitizer with the ozonator. I hope that I have been helpful.

Sincerely. Alan Schuster, 8/11/2005

 
► Ozone And The Environment?

Will my spa's ozonator add to the problem with the Earth's ozone layer?

John H., 1/5/2016

No! The small amount of ozone produced will quickly decompose, back into oxygen, after leaving the spa. I hope this puts your mind, at ease.

Sincerely. Alan Schuster, 1/5/2016


► Pool And Spa Sanitizer Compatibility?

My wife and I recently purchased a hot tub. Expecting delivery shortly. The salesman is pushing biguanide like he owns stock in the company. Although he talked us into the ozone generator, he suggested we “unplug” it and use biguanide, as a sanitation regime. I am currently leaning towards the ozonator coupled with a mineral purifier and occasional shock as needed. Dichlor? Let me know! My concern is, we currently have a pool treated with biguanide. Our teenage kids will likely going between the hot tub and pool. Should we be concerned with any chemical incompatibility problems considering the two different sanitation regimes with the pool and spa? Your expert advise is welcome, as we are novices.  Great web site!  I also recently ordered your spa/hot tub book and look forward to reviewing its contents, so you are not bothered with more annoying questions from us! Many thanks.

Edward S., San Clemente, CA, 3/31/2007

Use the ozone generator and forget about the biguanide! You'll be happier in the long run, using the combination of ozone and a mineral sanitizer. With biguanide, you'll have foaming problems and a greater potential of resistant microorganism problems. The issue of compatibility is a really good question. Biguanide and any mineral sanitizer are incompatible. And yes, there will probably be cross contamination between the pool and the spa. Want to know what I would do under these circumstances? I would stop the biguanide in the pool and add an ozone generator and a mineral sanitizer. This eliminates any incompatibility and you should have quality water in both places. It is almost inevitable that sooner or later you will have to give up the biguanide. Pools that are maintained on biguanide seem to have a high probability, of the formation of a sanitizer-resistant microorganism, after a few years of use. Check the archives for biguanide in pools and spa to see some examples. Dichlor is appropriate and the questions are never annoying! I hope that you'll find this information helpful.

Sincerely. Alan Schuster, 3/31/2007


► Ozone And Monopersulfate?

After looking through your list of Q&A, I did not see anything about monopersulfate. I have a 500 gallons spa and I use an ozonator and spa shock. Also, because it is used frequently by many people, we were told to use a sanitizer. My question is, when I use the strip test it shows that the pH balance and alkalinity are good but the mps (monopersulfate) is at the very low end. The test strip shows a normal level would be purple in color and mine show white. What should I do to remedy this problem, and what happens if nothing is done to correct this. Thank you.
 
Nicole, 7/10/2004

You should use a backup sanitizer, with an ozone generator. However, monopersulfate is not a sanitizer. It is an oxidizing agent. I suggest that you use bromine, as the backup. You can either use bromine tablets in a floater or add a dose of sodium bromide monthly and continue with the periodic additions of the monopersulfate. The sodium bromide will be oxidized to bromine by the monopersulfate. With the ozonator, you should be able to have excellent quality water, by maintaining a bromine level of 1-2 PPM. Bromine can be measured on most spa test strips. During peak bather loads or whenever the bromine level is too low, just add some more monopersulfate to boost the level. I hope that the information proves helpful.

Sincerely. Alan Schuster, 7/10/2004

 
► pH And An Ozonator?

My spa is equipped with an ozonator and a Mineral Sanitizer. Does the ozonator affect the pH?

Greg M., Fresno, CA, 12/12/2006

The ozonator produces ozone by combining 3 molecules of Oxygen (O2) and forming two molecules of Ozone (O3). There is no affect on the pH. During the reaction of ozone with the organics wastes, by-products could be formed, that affect pH. The effect, in a properly balanced spa, should be minimal. A Mineral Sanitizer will help add stability to the pH, as it does not appreciably affect acidity or alkalinity. I hope that this information is helpful.

Sincerely. Alan Schuster, 12/12/2007


► Why Do I Need To Add Bromine?

My spa came equipped with an Ozonator. I was told that ozone is a sanitizer. But, I was also told that I should maintain a low level of bromine. Why? Thank you.

Bill F., Kalamazoo, MI, 4/15/2012

Ozonators are, indeed, very popular in spas. The limitation of ozone is that once production has ceased, the ozone does not remain in the water for any length of time. There is no residual. Fortunately, in a spa, you can set the timer and pump to operate for periods throughout the day. This helps keep the periods, without ozone, shorter and that helps in the control of microorganisms. In order to assure that there is always some sanitizer present in the spa water, it is typically recommended that a backup sanitizer be used. In your case, the dealer suggested that bromine be used: a very popular choice as a backup. You will have to add much less bromine because you have an Ozonator and you should be able to keep it at a lower level(1-3 PPM, instead of 3-5 PPM). Ozone and bromine are a really good combination and the dealer made a good recommendation. Adding a mineral sanitizer will allow you to use less bromine to maintain this low level and will provide persistent backup sanitation. This product is a recognized spa water, that can be used with bromine or chlorine. I hope that I have been of assistance.

Sincerely. Alan Schuster, 4/15/2012


► Is The Ozonator Working?

Hi Alan. How can you tell that the ozone is working, I have a U.V. ozone generator approx. 2 years old. I am planning to use a mineral purifier and ozone, because chlorine gives me a rash and biguanide keeps clouding up within one week after filling. Should I buy a new ozone generator to be safe? Thank you.

Tom, 1/29/2010

I can't tell whether or not you need an ozonator, but you should check it out. Most ozone generators need a replacement bulb or part, after 2-3 years, more or less depending upon usage and conditions. Some ozonators have indicators that can determine, if they are producing ozone. You might be able to smell ozone, after lifting the cover.  If you are not producing enough ozone, the mineral sanitizer alone will not be able to keep the water clear because it cannot destroy organic contamination and buildup: there would be a noticeable loss of water quality! The combination of ozone and a mineral sanitizer should work out very well for you. Just make sure that you maintain the other spa water parameters: pH, TA and calcium hardness. I hope that I have been helpful.

Sincerely. Alan Schuster, 1/30/2010


► Ozone, Mineral Sanitizer And More?

I emailed you a month or so ago about mineral purifiers and ozonators. Since then I have tried using dichlor for shock only to find out that it gives me a rash for about 3 or 4 days. My pH and alkaline are in good shape and I run my ozone for 12 hours a day, 6 on 6 off. I'm going to go back to a non-chlorine shock. Do I still need to use a sanitizer like bromine or can I get by with just the shock, purifier, and ozone? Thanks Again.

Curt M., Hays, Kansas, 5/13/2009

You might just be sensitive to chlorinated cyanuric acid (dichlor and trichlor) and not necessarily to other forms of chlorine. It is hard to tell, from this limited information. But, you do know how to avoid the problem! Your ozonator should be able to meet most of the sanitizing requirements. Because ozone does not remain in the water for long periods of time, I suggest that you continue to space out the ozonation periods, throughout the day. The lack of permanence is the reason for the need for backup sanitizing. In this role, the mineral sanitizer works well. You should only need to add the non-chlorine shock after periods of heavy bather usage or upon signs of a loss of water quality. Good luck and enjoy the spa.

Sincerely. Alan Schuster, 4/13/2009


► Ozone and Ionization In A Spa?

An Ozonator was installed, in my spa, as part of the original equipment. I have been using chlorine as a backup. Would it make sense to add an Ionizer as a backup? Will it eliminate chemicals? Thanks.

Phil, Sausalito, CA, 4/4/2010

Makes sense to me. Adding an Ionizer, as a backup sanitizer will reduce the need for the chlorine. Inasmuch, as the Ozonator eliminates most of the need for shock treatment or other oxidizers, you should only have to control the pH and total alkalinity. However, for best results, maintain a free chlorine level of about 1 PPM, to act as a sanitizer backup. If you're looking for convenience, this should fill the bill. I hope that I have been helpful.

Sincerely. Alan Schuster, 4/4/2010


► Effects of Ozone?

Alan, I have read about ozone in which it is damaging to our lungs above ppm. I have a spa that ozone is injected 24 hours a day and can be smelled when entered. Is this dangerous in any way at all.  If so what can I do?  If I sit in the spa for 15 minutes or more, I can notice my chest getting tight. Is that from the heat or the ozone. Thanks.

Scott H., 3/11/2011

Yes, it is true that ozone can be harmful, especially in high concentrations. However, Ozonators do not produce high levels of ozone and much of it reacts with the wastes in the spa water. Elements of your question are clearly medical in nature and I suggest that you seek appropriate medical advice, as to the possible causes of your symptoms. There is something that you can do to reduce the airborne concentration. Have an exhaust fan controlled by a humidistat: this will help reduce the concentration. It is possible to have ozone production suspended during actual use of the spa. My spa did not produce ozone, with the high speed pump turned on. It only produced ozone with the low speed setting, which was controlled by a timer. The timer was set to avoid the most likely periods of use. I hope that I have been of some assistance.

Sincerely. Alan Schuster, 3/12/2011


► Ozone And Chlorine In A Spa?

I have been using a granular dichlor in my spa. The results have been OK, but I would prefer less chemical odor. Would adding an Ozonator help?

Bob C., CA, 12/15/2006

Definitely! Ozone will act as a backup sanitizer and allow you to maintain a lower level of chlorine.  In theory, all you need is a trace amount of Free Chlorine. To play safe, I would suggest a level of 0.5-1.0 PPM, as opposed to 1-3 PPM without the ozonator. In addition, you should find much less of the odors associated with the reduced chlorine use. Bromine, mineral sanitizers or ionization units can, also, be used in the back-up sanitizer role with ozone. I hope that I have been helpful.

Sincerely. Alan Schuster, 12/16/2006


► Ozone And How Much Chlorine?

Thanks for your website. I have a question. I just learned that the spa that came with the house I bought has an Ozonator in it. I don't know how old it is. I read all the responses on Ozone and Chlorine and I do not understand how I can know how much Chlorine to put in my spa? "Keeping a level of 0.5-1.0 PPM" sounds like a question of faith that the Ozonator is working and it is clear that they become less effective with time. As they become less effective, I would expect to be adding more backup sanitizer. But how much? Thanks.

Greg, 4/2/2020

The addition of an ozonator is something that will make maintenance easier and produce higher quality water. It will reduce the chemical consumption. Using an ozone generator helps reduce chlorine additions. However, how much chlorine is required will depend on the ozone output, how it is produced over time and bather activity. There is no set amount that you can add. Test the water and make additions, as needed. You can test for ozone, to confirm the unit is working. Visit the website test equipment store, for more information. For testing purposes, I suggest the LaMotte ColorQ 2X all-digital Water Analyzers, as they provide the right kind of information. Because ozone levels are fleeting, you might add a mineral sanitizer, as well. The combination of the two work well together. All you should need is a very low level of chlorine, one half the usual level.  Bromine would be a better choice, than chlorine, as there is less odor and it is less irritating. You would need 1-3 PPM, when used with the appropriate mineral sanitizer. I hope that this information proves helpful.

Sincerely. Alan Schuster, 4/2/2020


► Adding A Floating Dispenser?

My spa (200 gallons with ozonator) is being sanitized with chlorine. The tub is unattended for sometimes as much as a week. Is there a Dispenser that can chlorinate when we are not there? Thank You.

Al H., 9/8/2004

There are floating dispensers that could be used with chlorine tablets, but it is not something that I would recommend. The tablets are acidic and will dissolve too rapidly at the temperature of a spa. You should be able to get by with just boosting the free chlorine level to 3 PPM before leaving. If the ozonator is on a timer and the water was in good condition before, upon departure, the spa should remain in good condition. If you want to leave a floating dispensing in the spa, you can do it with bromine. The bromine product is slow dissolving, even at spa temperatures. You should be able to get by with the dispenser set at the lowest level. I hope that this information will prove helpful.

Sincerely. Alan Schuster, 9/8/2004


► Best Use Of A Spa Ozonator?

My spa is equipped with an Ozonator and I operate the pump (and the Ozonator) for 8 hours a day. We have it set to switch on about 9 hours before we normally use the spa. That way the water is warm and the conditions should be ideal. Is it better to run the spa for 4- 2 hour periods or 1-8 hour period?

J. D., 12/2//2006

I would prefer to operate the ozone generator for 4-2 hour periods, instead of a single 8 hour period. Ozone sanitizes best while it is operating. Having four runs per day will sanitize the water four times daily and make microorganism growth less likely. One 8 hour run will leave 16 hours without effective ozonation. You should be using a sanitizer backup such as: a salt chlorine generator, chlorine, bromine or mineral sanitizer. This helps assure sanitizer presence, during the periods that ozone is not being produced. I hope that I have been helpful.

Sincerely. Alan Schuster, 12/2/2006
 

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