Black pool water, green-brown pool water discoloration: discolored pool, green-brown

Alan, I had written you a couple of days ago and I am in need of more assistance. My pool water has a green color. The water is clear. I thought it was an algae problem since the water was clear. I was told my the local pool place that I should add a copper algaecide (1 1/2 oz for a max of 3 days). I did so and my pool looks the same. I don't know if the algae is dead or not. I tried to vacuum it and nothing came out of the waste. The side of the pool is not slimy either. All of my levels are perfect. I shocked the pool with 2 bags yesterday and still it looks the same. Should I still shock it everyday and hope it turns blue? If so, how much shock should I use? I am stumped because I thought one of the things I tried would do something. My return skimmer has a strong current, my water is circulating great and all of my baskets are clean. My pressure is below 10 on the pump. The pump is brand new. Please help me! Thank you.

It doesn't seem that the problem is algae and adding more shock is not likely to change things. Instances of crystal clear green-colored swimming pool water are not all that uncommon. It is probably being caused by the presence of highly colored metallic colloidal particles. Water testing will probably, but not always, point to a cause. I suggest that you do the following: add a dose of a quality mineral treatment, filter for a few hours and then add a dose of a quality "Blue" Clarifier. This has been a very successful treatment over the years. I hope that it all works out for you.

I have a vinyl pool with the ring top it is an 18' x 48" and I am just hysterical about the green colored water. I have done just about everything I can do or at least know how to do. I have cleaned the filter a dozen times, added algaecide and clarifier, more chlorine tabs and shocked it twice and nothing is happening all except the free chlorine level has risen to 10 and the pH balance is very low. I am about to give up on my pool I am just so disgusted about the situation that has occurred with the pool. I am spending a lot of money just trying to clear it up. Please help me. I have vacuumed the bottom out cleaned down the sides if this is helpful info.

With a Free Chlorine reading of 10 PPM and the possibility of a low pH, it is extremely unlikely that the problem is algae. Much more probable

is the presence of iron or other minerals. Iron can cause amber-colored pool water, that will appear as green against the blue pool liner. I suggest that you have the water tested for iron and copper. Their presence will require the addition of a metal treatment product. If this is the problem, the addition of sufficient product will help to decolorize the water. Afterwards, adjust the water chemistry and add another dose of clarifier. Treating iron staining and discoloration, with some chemicals, leaves the door open for a return of the problem, with or without the addition of new water. Using The METALTRAP filter to recirculate the pool water, will help to permanently remove the metallic ions and, if used to filter new water, it will prevent new metals from getting into the pool. Just attach to a garden hose and you can be ready to go. To recirculate, just add a small submersible or cover pump. I hope that this information will prove helpful.

It would seem that the filters (Metal Trap & Pure Start) are expected to be used when adding water to a pool. Do you see them being used with some sort of pump to circulate the whole pool water thru them, to filter out the metals or is this just out of the question? Thanks, as always, in advance.

I have a 22 x 41.6 inground vinyl liner pool. I can't seem to get it clear! It has had a dirty greenish tint to the water and my steps are a yellowish-orange color that won't rub off. I have put granulated chlorine in it twice in the past four days(18 cups). We have had to backwash just about every day and the waste water is yellow. I am really concerned about my steps that were once WHITE. Can you help me?? And do you know what I can do to clear my water? Thanks.

It sounds like you could have a problem with iron. Did you use well water to top the pool off? That would explain the yellowish color on the steps and in the water. Against the blue background, it could appear greenish. Have the pool and tap water tested for iron. Try this! Shut off the filter and slowly pour about 1/2 pound of pH reducer onto the top step. Let the water become still. After about 30 minutes, use a nylon bristle brush on the steps. If it made a difference, the problem is definitely iron. Treat elsewhere as needed. You should add a double dose of a quality metal treatment now and whenever, new water is added. The water clarity could be related or due to normal pool opening problems. Raise the Free Chlorine level to 5 PPM and keep it there until at least 1-3 PPM remains, after an overnight period. Make sure that the pH is 7.2-7.6. Check out the filter and make sure that it is being operated continuously, until the water is clear. Backwash only when the pressure is too high! Adding a dose of a blue clarifier can help improve the filter efficiency. I hope that this information will help clear things up.

I am having an inground pool built and I know that the water that will be used to fill it has some sulfur in it and probably other organic decomposition products, as well. Can I treat the water, as the pool is being filled? Thanks for any help, you can offer.

Planning ahead is the best thing you could have done. The PURESTART Pre-Filter will remove sulfur and organic contamination, as the water passes through this cartridge-like filter. It simply attaches to the hose, that will be used to fill the pool, and removes sulfur and organic contamination, as water passes through the media inside. If you use it to treat all the water used to fill the pool and to top it off, in the future, you will keep these offensive materials out of the pool. It should make getting the pool into chemical balance a lot easier and less expensive, as well. Good luck with the pool and I hope the information is helpful.

Why does my pool water turn a green color, after it rains? Please be specific! Thank you.

Most likely the green color is caused by the early onset of algae problems. If you free chlorine level was on the low side, the rainfall could have introduced materials and debris that depleted the free chlorine, thus allowing algae to start growing. This is why it is commonly recommended that a pool be shocked after heavy rainfall. I hope that the mystery will clear up and that I have been helpful.

We added a lot of water to our inground 18x36 pool. It turned a green color. The chlorine wasn't holding so we added 2 containers of conditioner/stabilizer. The pool and liner turned light brown. We tested and found the pH is low. We have added 15 bags of super shock and it has not changed. Any suggestions?

Most likely this is a pool opening. The chlorine wasn't "holding" because the chlorine demand of the water was so high. That's why you added 15 bags of super shock. You add stabilizer only when the level is too low. Too much can reduce the effectiveness of chlorine. The brown color could have due to metals, iron is the most likely, in the makeup water. What you need to do is get your ducks in a row. Have the water tested for Free Chlorine, pH, chlorine stabilizer total alkalinity, calcium hardness and iron. This will give you the proper basis for making corrections that are necessary. You don't want to throw the wrong chemicals at the problem. Make sure that the filter is operating properly. If there are metal present, add a double dose of a quality metal treatment. I hope that this information proves helpful.

Hello Alan, I've had my 20 x 40 inground pool for about 7 years. I have a 1-1/2 hp pump, sand Filter 26" diameter and an automatic pool vacuum. This season has been the worst with algae. I'm usually able to shock it out. This time, I've had to drain the pool level about one foot above the shallow end twice to reduce the buildup of cyanuric acid to 30-50 ppm. It never really cleared up this season. Now, the pool water is Turquoise colored. I still can't see the bottom. My wife "cried all season". My wife says she read on the web that the Laterals may be cracked. Unless I take out all the sand from the filter, how do I inspect the filter for cracked laterals? Alan, any information that you can share with me would be most helpful. It may even help my marriage! Thank you.

It is not unusual, from my perspective, for a sand filter to fail to remove dead algae. It can pass right through. I suspect that this is, in part, a filtration problem. Are the laterals cracked? No way for me to tell. Poor filtration can result from channeling or backwashing too frequently. I suggest that you start with a clean slate. Empty the filter and clean it out. If there are parts in need of replacement, you can make the necessary repairs. Fill it up with the proper type of filter sand. Once running, add 1/2 pound of D.E. This will act as "clean dirt" and get the filter pressure up and increase the effectiveness of the filter. Once the water is clear, backwash to waste. Reapply the DE and, thereafter, backwash only when the pressure is too high. As long as you are emptying the sand filter, there is another option. Instead of refilling the filter with sand, use Zeobrite: a sand replacement filter media that is capable of removing dead algae and producing better water clarity. The discoloration could be caused by a trace metal. Add a dose of a quality metal treatment. Have the water tested for iron and copper, as a means of confirming this possibility. I hope that this information will prove helpful. It has worked for lots of pool owners.

I am a new owner of a saltwater pool. We had a sand storm here last Friday and two days later my pool water color turned green. How do I take care of this problem? Add more salt?

The only time you need to add more salt is to replace any lost through pump out, splash out, leakage or backwashing the filter. Check the salt level! Most likely the sand storm introduced a cocktail of minerals and organic debris. This probably resulted in the depletion of the chlorine level and, perhaps, allowed algae to bloom. Check the Free Chlorine level! If low, turn up the chlorinator dial and/or add some quick dissolving shock. Make sure that the pH is 7.2-7.8. Once a stable Free Chlorine level has been established, the green water should disappear. I hope that I have been helpful.

Yesterday, after adding a normal dose of dichlor my water began to turn a green color. The strange part is that the water is crystal clear, without any haze. There is no cloudiness, no signs of algae on the walls and nothing wrong with the water tests. Just a crystal clear green pool water color. What do you think caused the problem? The pool is an inground, vinyl and 18,000 gallons - just in case you need that info. Thank you.

I've heard about this many times before. The first inclination is to assume that it's copper, but water analysis doesn't seem to bear this out. I think that it is the formation of highly colored colloidal particles, probably involving the chelated form of a trace mineral. The color particles can form after being oxidized or treated with a Mineral Treatment. Why I'm not sure. The good news is that it seems easy to treat. Try adding a dose of a quality Clarifier, such as the AquaPill Clarifier, and don't be surprised how well and how quickly it can work. I know of a story where a woman walked into a pool store and explained that she had "crystal clear green water." Having previously told the store personnel that this problem responds well to treatment with a Clarifier, the product was recommended. The woman purchased the product and called the store hysterically happy about the problem - the green pool water color was disappearing right before her eyes. What made this unusual is that it all happened within 10 minutes, of her leaving the store. Allowing for time to get home and add the product, that didn't leave much time for the product to do its work. It was this quick response that prompted the store personnel to call me with the news. How about that! I hope that it will work as well for you.

I recently setup and filled a 15' diameter by 3' deep pool for my children. I filled the pool yesterday with water from our hose and it looked fine. This morning the pool water has a green tint to it. The water temp is at 65 deg. I shocked the pool, but I wonder if I need some other treatment for the green colored water. I checked the filter and it did have brown deposits that easily hosed off. Any direction would be greatly appreciated. Thank you,

Mike, 7/3/2003

It is not likely that algae is responsible for the green-colored tint in the pool water. It is just too quick. Rather, the pool water color problem is, most likely, caused by trace amounts of iron. That would explain the brown deposits. The green tint could be an amber caste against a blue background. I suggest that you add a double dose of a quality mineral treatment ASAP. This should help complex the mineral and allow for better pool water color and quality. Get the swimming pool and tap water tested for iron, if possible. Refer to the archives under iron for more information. I hope that I have been helpful.

► Re-Appearing Green?

Hi Alan, thanks for your help in advance. My problem is, every time I add chlorine, the pool turns green for a couple of days. It is crystal clear blue before I add the chlorine, and then I add the chlorine and it almost turns green before my eyes! What the hay?

Rich. 10/19/2006

Pools that turns color after chlorine has been added usually have a metals problem. This can be very common with well water. ASAP add at least a double dose of a quality metal treatment. This might help avoid the discoloration and possible staining and should make an improvement. Bring in a water sample to a local dealer and have the water tested for iron, copper and other parameters. I suggest adding a dose of metal treatment for each 0.5 PPM of metals. Add another dose prior to adding new water. A monthly dose is an additional safeguard against a recurring problem. I hope that this information proves helpful.

Sincerely. Alan Schuster, 10/20/2006

► Added Chlorine And Pool Turned Rusty Color?

We had a 18' pool installed and it took more than a day to fill the pool. Everything was OK, until I added some chlorine. The pool turned an rusty-brown color. We have a well and added a bottle of some metal treatment, as the pool was being filled, as per the dealer's advice. Can we solve this problem?

Janice H., North Haven, CT, 6/5/2009

Pools that turn amber to rusty, brown or blackish, after addition of chlorine or pH raising chemicals, usually have iron and other heavy metals present. This is especially true, when well water is used. Whatever you added was not enough. If you had filtered the well water, used to fill the pool, through a METALTRAP filter, the heavy metals would have been permanently removed. When the pool needed to be topped off, all the new well water could have been passed through the METALTRAP Filter, to prevent new additions of metals. Removing metals, as the pool fills is the best insurance against future problems. There are chemicals means to treat metal problems and/or remove the stains they cause. Not all of these chemicals are equally effective, some are ineffective at higher pH levels and others contain phosphates, which can lead to other problems. Liquid METALTRAP is phosphate free and works over the full pool pH range and beyond. Adding this chemical can help avoid staining and/or discoloration. If staining has occurred, it can be removed with METALTRAP Stain Remover. This 100% ascorbic acid products helps to reduce and solubilize heavy metals, so that Liquid METALTRAP can keep them in solution in a chelated state, which is less colored and more stable. Following up with a recirculating treatment, using the METALTRAP Filter can permanently eliminate the metals. All you need is a garden hose and a small pump to do the recirculation. Good luck and I hope that I've been helpful.

Sincerely. Alan Schuster, 6/5/2009

► Ugly Color And A Bad Sulfur Smell?

We just filled our above ground pool, about 10,000 gallons, I believe, with well water. It stinks to say the least. Sulfur odors and an ugly color. Where do I start?

Greg N., Reading, PA, 6/30/2009

I guess you should bring in a water sample to a local dealer. He won't be able to test for all that is wrong. From the smell of things, you are going to need some real help. I suggest using a PURESTART Pre-Filter and a small submersible, along with a garden hose to recirculate the water. Keep the pool filter running. The PURESTART should be able to remove the offensive smelling sulfur and other organic contamination. Get the chemistry right and a free chlorine of 5 PPM and see what it looks like. As the water passes through the PURESTART, it should improve. In the future, always use the PURESTART Pre-Filter, when adding water to top off the pool. I hope this helps make a difference.

Sincerely. Alan Schuster, 6/30/2009

I don't know if you answer these personally or not but here goes. We purchased a above ground 15' vinyl pool with a blow up top ring. It has a round filter that can be washed out. The pool also came with no instructions about chemicals, or how to use them. So I started with chlorine pucks. I inserted one puck into my cute little duck chlorine holder and thought I was off to the races. This worked for about 2-3 weeks, then we went away for a few days and came home to this disgusting green pool. I forbid the kids to enter and put in 2 more pucks. Nothing happened except it was getting darker green. I went to a feed store that had pool chemicals and the salesperson had no idea on pools, so I got some pool clearer (it has no chlorine, but it promises to brighten up your water) and some pH down. (and a tester). After putting half a jug of pH down and some brightener in, I noticed some slimy green stuff floating to the top of the water, (it was disgusting) and the water is now light green and very cloudy. I have waited 2 days and I still don't have sparkling water. I don't know if it is yellow algae, green, pink, or whatever, but could you give me some advice soon. We are in Ontario, and the weather will soon be turning. Thanks for any advice.

It sounds like you have algae. This is the result of inadequate chlorination. The duck is cute, but you will have to supplement it with a quick dissolving chlorine: liquid, sodium dichlor, etc. This will be based on a water test. You want to keep the Free Chlorine at 1-3 PPM. The clarifier will not solve the problem. Nor, will the pH reducer. You need the pH at 7.2-7.6. Your water is not likely to clear up unless you boost the free chlorine to approximately 5 PPM and keep it there, until the water clears up. If the clarity problem is not solved, with a day or two, it may be that your filter is not functioning effectively. This should be looked into. It doesn't sound like pools are a big thing in your part of Ontario. There are certainly plenty of them in the Toronto area. I suggest that you refer to the archives on algae, pool water testing and cloudy pool water. I hope that this information proves helpful And, yes, I do answer the questions personally!

We have an above ground 30 ft round pool (6' in the middle to 52" outer rim). We currently have a sand filter and were wondering if that is the best system for this size pool? We have had the pool for 4 years and change the sand every year. But last year we had a difficult time keeping the pool water from turning a green color. We did not have any algae on the sides and the water levels were within limits. Yet the water keep turning green. Any suggestions for a new filter? Thanks.

Green algae is the most common type of swimming pool algae and results in greenish water. Think of it as your pool's way of telling you that you are not maintaining adequate sanitizer levels and/or water chemistry. Algae will grow if given the opportunity! It is important to keep the sanitizer level, chlorine for example, at a consistent level. A Free Chlorine level of 1-3 PPM is ideal. When a pool is used heavily the Free Chlorine can deplete quickly. Are you testing for Free Chlorine? Adding shock treatment can quickly restore the level. Don't fall into the trap of thinking that because the pool is not being used, you don't have to add chemicals: algae doesn't follow these rules! It is important, also, to operate the filter for adequate periods of time and have good circulation in the pool. However, filtration alone is not the solution! There is no reason to believe that you need a new filter - just better water management. If conditions had gotten a bit worse, you might have seen algae growing on the walls. Replacing the sand every year is a mistake, as the sand media becomes more efficient, as it removes particles. A better option would be to use Zeobrite, a sand filter replacement media. It lasts longer, produces better water quality, weighs half as much as sand and is modestly priced. You should consider shocking the pool after periods of heavy bather usage, heavy rainfall, loss of water clarity or anytime the chlorine level falls to zero. Periodic use of an algaecide and/or a phosphate eliminator can offer additional protection. Chlorine becomes less effective as the pH rises above 7.6 and levels of chlorine stabilizer, above 150 PPM, can reduce chlorine efficiency. Water testing is important! I hope that this information will help clear things up.

I have an inground pool 17 by 36, approx 19000 gals, it has a liner. Opened it and water was cloudy. Filled it with new water which was better than half capacity. Town has wells for water source. Vacuumed dirt . Added one gallon shock. Using jumbo chlorine tablets for sanitation. Water has turned robin egg blue about the color of the blue bolsters used for the winter cover. At 3 ft. depth the white stripe is hazy but visible. At the deep end it is solid blue and the bottom is not visible. Checked chlorine level and is higher than 1.0 PPM, pH over 7.4 and might be a little high. Alkalinity is about 170. Have added two pounds pH lower, but have not seen any difference. I am running the filter consistently with no improvement. What could be the problem?

Most likely it is a mineral related problem. I suggest that you have the water tested for copper. If present and, if you have a heater, it is the result of corrosion due to maintaining allow pH for extended periods of time, improper placement of the chlorine feeder or lack of a check valve. If there is no heater, it could be from the well water or a copper algaecide. In either case, add a couple of dose of a quality metal treatment. Keep the filter running. The next day try adding a dose of a blue clarifier. Even better than regular clarifiers, which are short acting, consider adding a NanoStick Clarifier. It uses non-technology to destroy organic contamination requires no installation and lasts for 4-6 months. It will clearly improve the look and feel of the water. If you have a sand filter, as I suspect, you might consider replacing the sand with Zeobrite: a sand filter replacement media that produces water quality that rivals DE. Good luck and I hope that this information proves helpful.

Hi Alan, my pool water is turning green! What is the quickest way to shock it? I have shock products. However, those never seem to do an adequate job. Someone suggested liquid chlorine. I have never used it. Mainly use the 3" tabs after shocking. We are not in the swim season, although I can't stand watching the pool turn green. Please help. Thanks.

The pool water is turning a green color because of algae growth. Just because you are not using the pool does not mean that chlorine and filtration are not needed. You may be able to get by with less, but you still must have enough chlorine to control algae. You didn't provide any specifics, which might have been helpful. Liquid chlorine should be fine. Add a gallon for each 5,000 gallons of pool water. Make sure the filter is operating. Test the water for Free Chlorine and add more shock, until the level rises to 5 PPM or there is at least 1-3 PPM present, after an overnight period. Don't drag this out, as it will only increase the amount of chlorine or shock treatment required. Once the water is clear, you need to make sure that the chlorine level is maintained. If you have a feeder, keep it filled and test the water weekly. I hope that this information will prove helpful. Spring is coming!

I have never had this problem in the past 12 years that I have had an in ground plaster pool. I noticed in the winter when my husband was getting some of the leaves out that the water had a purple hue to it, as well as some stains. I thought my eyes had gone funny! I pulled my pool cleaner out and there was purple on the white tubing. My water is crystal clear and all of my chemicals are correct, but I have a dust of purple in the bottom of the pool. I have scrubbed the sides where it was also and that has dislodged, but I am curious what it is. Thanks.

There are several possibilities. The purple color could be due to trace metals, possibly forming a colored complex. I sugge

st that you add a double dose of a quality metal treatment and allow it to circulate for eight hours. Afterwards, shock the pool. The metal treatment should help complex the metals (iron, copper, etc.) and the shock treatment should destroy any tannins that leached into the pool water from the leaves. If you use the METALTRAP regimen, you can remove the stain and remove the metals, as well. You start by adding ascorbic acid, as directed. This helps dissolve the stain. Next Liquid METALTRAP is added, to complex or chelate the metals, in order to keep them in solution. Next. you recirculate the pool water through a METALTRAP filter and those heavy metals will be permanently removed. In you plan on refinishing the pool, ask the contractor to add water to the plaster, after it has been run through the METALTRAP filter. If might help prevent the finish from slight discolorations. By all means, when the pool is refilled, pass all the water through the METALTRAP. Removing metals, as the pool fills is the nest insurance against future problems. Remember, always use the METALTRAP to treat all new water. I hope that I have been helpful.

I saw your correspondence with the lady who wrote in March about the purple pool water. We started having trouble with this last fall and are still. Toward the end of the season last fall, all of the sudden one day our pool water seemed lavender. We then noticed it was really a bright lavender film that was all over everything where the water was. I was able to brush it off the sides of the vinyl liner, but it also was all over any of the white tubing fixtures in the return wells, on the stairs etc. It clogged our cartridge filters badly and could not be gotten off of the filters, even with our power washer. We ended up throwing them away. We closed the pool with clear water and sides washed as best as possible. I took the cover off of the pool just yesterday, and it seems that over the winter, the purple stuff has grown back. There’s a new purple film all over everything. I asked our local pool company about it, and they said it probably was a metal problem. I don’t think so. I think this is a new bacteria or algae species that is so new that pool companies don’t know about it yet. Your thoughts are appreciated and welcome. I really do not want to open this pool with this problem and goop up our new filters. Thanks.

Metals is still my first choice. Pool dealers would not know one bacteria or algae from another - they are not microbiologists! I suggest that you have the water tested for iron, copper and, especially, manganese. If you have been diligent with maintaining the free chlorine level, algae is less likely. And algae can come in all sorts of colors. Let's try this. Put 1/2 pound of pH reducer granules in a white sock. Shut off the filter. Drop onto a stained area and leave in place for 15 minutes. Move around with a pole. If this helped, it is positively a metals problem. If it did not work, try the same thing with either ascorbic or oxalic acids. If this works, the problem is metals. If not, it could be algae. Let me know how the tests turn out and we'll go on to the next steps. Or refer to the archives on Pool Staining. Good luck and I hope that this information proves helpful.

Right to the point. We have "BLOOD RED" pool water! We use well water and after chlorine was added the water turned! Please help us find an answer, if not we'll be forced to use agricultural water and who knows what problems that will bring! Thanks in advance. I HOPE!

Your well water sounds like it is unfit to drink and possible not suitable for a pool. The iron content seems very high, as no one has ever described the water as being blood red. Yes, you can add chemicals, but it will take a lot. A better option would be to have good quality water trucked in. What do you use for household purposes? If you use a softener, that is how I would fill the pool. If you want to press on, I suggest that you have the water tested for iron, copper and manganese. You will have to add at least on dose for metal treatment for every 0.5 PPM. Maybe even more! Using agricultural runoff will add phosphates, nitrates and more. It is a really poor option. I hope that this information will be helpful.

I have a problem with my pool. It is 15 X 30. I have a brown mist on the pool floor. I checked with my test kit and everything seems to be fine. I check the water and it is clear. I, then, tried to vacuum the pool and the floor cleans up. The pool water gets hazy brown and then comes morning time, the brown settles back to the pool floor. What is it and what can I do? Please e-mail me.

What you are describing is silt: fine particles that settle to the bottom. These particles can be minerals, dead algae, debris, etc. Without a main drain, it can be difficult to remove the silt. Make sure that you operate the filter during periods of activity. That way, the filter will have a chance to remove the particles that are lifted off the bottom. Try adding a "Blue" Clarifier. These products will help coagulate particles and make their removal more efficient. Is the filter operating properly and for long enough periods? If you have a sand filter, do not backwash too frequently - usually only if the pressure is too high. Try vacuuming before the pool is used in the morning. An automatic pool vacuum will easily remove and control the silt and help solve the water clarity problem. Something to consider? For more information on this product visit: www.smartpool.com When I lived in Brooklyn (Bensonhurst) pools were rare, but there were plenty of trees. I hope that I have been helpful.

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