spa water filtration: filtering spa water, disposable spa filters

Proper filtration is one of the keys to better water quality and clarity. While most spa utilize a cartridge filter for convenience, it is not always the best or most efficient way to filter spa water. High efficiency filters can remove micron size particulates, that might otherwise pass right through a standard filter cartridge. The more efficient filtering of various particles reduces the need for chemicals or makes them more effective. This, is turn, makes cloudy spa or hot tub water less likely. Clicking on the underlined and highlighted "keywords" or "catch phrases," in the archived answers will give you access to additional information on that topic or product. Please refer to the Glossary, if there are terms or phrases that require explanation. For an alphabetized listing of the entire contents of the website, use the Table of Contents link, on top of every page.

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More Product and Ordering information about The METALTRAP Filter, The PURESTART Pre-Filter and The METALTRAP Stain Removal System is available, by clicking on the center image, above. Use these unique products to treat potentially poor quality water and to remove and prevent stains and discoloration, due to iron, copper, manganese, organic contamination & more! Additional information about some new & unique products, for spas & hot tubs, can be found by visiting The Website Stores. You'll never know what you'll find and that's always fun. Be better prepared and avoid costly problems!

► High Efficiency Pre-Filtering?

I am debating switching my regular filter to a disposable micro filter. It was independently tested and is 94 % efficient at removing particles at 1 micron. With this filter, you are supposed to get rid of using defoamers, decalcifiers, basically any liquids normally added to the tub. The filters will last 2-4 months and are about $30. Less expensive than using all the other materials. According to the company, it will remove all particles that can cause damage to the hot tub. Of course, you still need to have sanitizer in the tub. Just wondering if you had an info or thoughts on these filters. The spa manufacturer, in my city, sells all their tubs with these filters and has for over 3 years. Thanks in advance of your thought. Cheers.

Derek, Canada, 3/14/2009

Depending upon the quality of your source water, a high efficiency filter can make a significant difference. There is a simple way to do this, without using disposable cartridges or replacing your existing filter. The PURESTART 1 Micron Pre-Filter will remove particles down to 1-micron, many types of bacteria and viruses and more. It you use a small pool cover pump and a garden hose, you can recirculate the water and remove particles of 1-micron or larger. If you use it, when the spa is refilled, think of all of the stuff you'll be keeping out of the spa. Better filtration should improve water quality and reduce the need for some or most of the accessory chemicals. You will still have to maintain a proper sanitizer level and keep the pH, TA and calcium hardness within acceptable ranges. There is no doubt that the PURESTART 1 MICRON Pre-Filter is better than the standard spa cartridges, used alone. I hope that I have been helpful.

Sincerely. Alan Schuster, 3/14/2009

► Floating White Particles?

We recently purchased a home which has an above ground spa. Unfortunately we were not left any reference materials related to the spa. It has been cleaned, but we are still seeing small black and viscous white particles floating throughout the water, no one has used the spa since we moved in. I assumed that the filter would take care of this, but the particles are still there. Is there something that we can do about this as we REALLY want to use our spa. Thank you for any advice that you can offer.

Angela G., 5/8/2007

What you are describing is the flaking off of scale and copper corrosion deposits from the heater coil. The white particles are calcium carbonate and the dark ones are probably oxidized copper. I suggest that you add a dose of a calcium scale treatment and a metal treatment. These products should help end the problem within a few days. Have the water tested for copper and calcium hardness, as this will provide insight into the problem. If the problems continue, you may want to do the following. Allow the chlorine level to zero out. Lower the pH to about 6.0 and keep recirculating the water. When there seems to be no more white particles, drain and clean the spa. Refill, add a dose of a calcium scale treatment and resume normal operation. Depending upon the type of filter that you have, calcium minerals can be passing right through the filter. I hope that this information proves helpful.

Sincerely. Alan Schuster, 5/9/2007

► Using Well Water?

I would like to fill a 400 gallon spa with well water. The spa will be sanitized with an ozonator and a bromine floater. I plan on adding some metal treatment before the chemicals. Anything that I should do?

Bill M., 2/4/2006

Have the water tested, to know what you're dealing with. Iron, copper or manganese are commonly found in well water and can cause staining and discoloration. The best treatment is the physical removal of the metals. While there are chemicals for this purpose, many contain phosphates and can degrade, over time, allowing the staining and discoloration to return. You could use The METALTRAP Pre-Filter, as the water is added to the spa. It attaches to a garden hose will help to physically remove the metals that most frequently lead to staining and discoloration. It is far better than just adding chemicals. After the spa is filled, you should continue to use it, when adding new water. The will help maintain better water quality and reduce chemical consumption, for metal and stain treatment. I hope that this information proves helpful.

Sincerely. Alan Schuster, 2/4//2006

► Cleaning A Spa Filter Cartridge?

What's the best way to clean a spa filter cartridge. And how often?

Jessica, Tampa, FL, 12/6/2004

There are Spa Filter Cleaning Products available: these products are usually acidic, detergent solutions. Hose the cartridge off to remove hair and other debris. The cartridge should be immersed in a plastic container (5-gallon pails are perfect) containing water and some of the cartridge cleaner. Follow directions, as to duration, etc. If the container isn't deep enough, turn the cartridge over to immerse the other end. Hose off to remove all traces of the cleaner when finished. How often the cartridge should be cleaned will depend upon the water chemistry and the amount of bather wastes. Any time that the return flow seems weak is a good time to clean the cartridge. Otherwise, every month or so and whenever the water is replaced. Using The Blaster Automatic Filter Cartridge Cleaner will do it without all the work. It simply attaches to a garden hose and does the rest. Enjoy the spa. I hope that I was helpful.

Sincerely. Alan Schuster, 12/6/2004

► Blue/Purple Deposits In Filter Cartridge?

Wondering if you could help please. On changing the filter on my spa, I found it was covered in a blue/purple deposit, so much so it was slowing water flow and causing the pipes to "bang and rattle" when going through the propane heater. The banging stops with the filter is removed. I balance the spa with chlorine tabs and pH it with Bicarb Soda, Nothing else is used. Help??? Thank you.

Nick W., 3/13/2009

Chlorine tablets are not recommended for use in a spa, especially not if they are placed in the skimmer basket. Trichlor is far too soluble, at the temperature of a spa. If you place it in the skimmer basket, its acidic nature will lead to copper corrosion. If used in a floater, it will tend to lower the pH and lead to corrosion. The blue-purple deposits in the filter seem to confirm that copper corrosion has occurred. I suggest draining and cleaning the spa and restarting using another means of sanitation. Otherwise, your heater might end up needing to be replaced. There are different ways to sanitize a spa. I suggest that you consider the use of ozone and a Spa Frog mineral sanitizer, along with a low level of bromine. The addition of an ozone generator and mineral sanitizer is something that will make maintenance easier and produce higher quality water. I hope that I have been helpful.

Sincerely. Alan Schuster, 3/13/2009

► Spa Sediment?

Hi, I have a Spa that over the last month daily has a sediment on the one step in the morning that resembles soft brown sand. I can vacuum it up and within 4 or 5 hours will start to reappear. Do you have any idea what this might be. Thanks.

Walt, 7/16/2007

The sediment is probably waste materials, minerals or dead algae, mold, bacteria, etc. In any event is seems likely that may be too small to be removed by your filter, even if lifted off the bottom. Start by checking your filter. How old is the cartridge? Adding a dose of a blue clarifier could help coagulate the sediment and make it easier to filter out. Depending upon how the spa is being sanitized, it may simply be a matter of adding shock more often. There is a simple way to remove ultra fine particles for an existed filled spa or from new water being added, without using disposable cartridges or replacing your existing filter. The PURESTART 1 Micron Pre-Filter will remove particles down to 1-micron, many types of bacteria and viruses and more. It you use a small pool cover pump and a garden hose, you can recirculate the water, removing particles of 1-micron or larger. If you use it, when the spa is refilled, think of all of the sediment that you'll be keeping out of the spa. I hope that these suggestions prove helpful.

Sincerely. Alan Schuster, 7/16/2007

► Spa Filter/Sanitizer Choice?

Hi. Which is a better spa filter-an ozonator or a MicroPure product?

Roger H., West Sacramento, California, 3/15/2008

An ozonator is not a filter, but helps produce better water quality and fewer chemicals. Even better would be an ozone generator and mineral sanitizer for sanitation and oxidation of wastes. The addition of an UltraPure ozone generator is something that you would be wise to consider, as it will make maintenance easier and produce higher quality water and will reduce the chemical consumption. You might add a FROG mineral sanitizer, as well, since it will provide additional, persistent sanitizing. The combination of the two work well together. All you should need is a lower level of chlorine or bromine, as it will act as confirmation that proper conditions are being maintained. I hope that this information proves to be helpful.

Sincerely. Alan Schuster, 3/15/2008

Thanks for the great information! Are the Spa Frog mineral sanitizer and the other leading brand about the same in effectiveness?

Roger H., 3/16/2008

The Spa Frog Mineral Sanitizers can be used, with chlorine or bromine and is registered by the E.P.A. as both a spa disinfectant and as a spa sanitizer. The other leading product cannot be used with bromine and is E.P.A. registered, only, as a spa sanitizer. I hope that this clears things up.

Sincerely. Alan Schuster, 3/18/2008

► Gray Accumulations?

Since installing the spa frog inline system in our hot tub we have noticed this thick grey almost mud like (grey) residue gathering on the water line in certain areas and at the filter of our hot tub when both pumps are on high. Could this mean that the mineral level is set to high? It is set at 6 as instructed but the instructions do not tell you to adjust it at all...why are the other settings an option then? All our other water chemistry is perfect. Do we need to drain our spa and start again. Thank you.

Nova S., 7/26/2009

It is hard to be specific. It could be due to minerals present in the source water, organic bather wastes. body oils or cosmetic residues. You might consider using a PURESTART 1 MICRON pre-filter to recirculate the water. It will remove mineral particles, as small a 1 micron. Simply attach to a garden hose and small pump. As it recirculates the water, it removes ultra small particles, including minerals, organic matter, cosmetic residues and even some bacteria and viruses. The addition of an UltraPure ozone generator is something that you would be wise to consider, as it will make maintenance easier and produce higher quality water. It will reduce the chemical consumption. You should continue with the Spa Frog mineral sanitizer, as well, since it will provide additional, persistent sanitizing. The combination of the two work well together. All you should need is a lower level of chlorine or bromine, as it will act as confirmation that proper conditions are being maintained. Spas are usually drained about every three months, more or less depending on usage and water quality. I hope that this information will prove helpful.

Sincerely. Alan Schuster, 7/27/2009

► Where Does the Chlorine Go?

Good day, Alan, We are new to the world of spas here in Florida. We use chlorine as our sanitizing agent. I don't understand why when you enter a spa and the chlorine and pH levels are where should be, and 30 min. later when you get out, the levels are much lower. Is this normal? As I said, we are new in this arena. I didn't realize that you had to add chemicals after, or before, each use. Guess we can learn something new every day.

Joyce & Jim, Florida, 9/15/2003

The typical pool in your neighborhood has about 60 times more water than your spa. Add to this the fact that the spa is at a much higher temperature and this will produce more bather wastes. This means that the typical spa gets more demands put on its sanitizing system than the typical; pool. Sanitizer levels can be depleted very quickly and it just makes sense to test the water and add more chlorine before and after each use. However, if the spa is equipped with an ozonator or UV sanitizing unit, less chlorine will be used. Ozone and UV units have controllable effects on the sanitation, while chlorine effectiveness rises and falls with its concentration. These alternative means of sanitizing spas are more flexible and provide a higher degree of effectiveness through use of a backup system. Much of the chlorine or Ozone is used to destroy wastes that cannot be removed by standard spa filters. Refer to the archives on a variety of spa and hot tub sanitizer topics. I hope that I cleared up the mystery.

Sincerely. Alan Schuster, 9/15/2003

Proper water chemistry will help to better control and avoid sanitation problems and maintain more optimum bathing conditions. More information about Pool/Spa Water Testing Products can be found in the Test Equipment Store.

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