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Orange or yellow-colored spots in pool water or on pool surfaces is generally called mustard algae. This can be brushed off, but unless you use a strong algaecide they'll come back.

You make sure your alkilinity and pH are correct, add 2 and 1/2 gallons of liquid chlorine, 4 to eight caps full of Yellow Treat, lightly brush the pool, run pump 24 hours,backwash or rinse cartridge, keep stabilized chlorine tablets in your pool weekly and start by checking your T.D.S. level's and see if you have stabilizer in your water. No Mor Problems is also a excellent product that can be used in conjunction with Yellow Treat.

use mustard algecide. simple as that. its like 15$ a quart.

I use a product called "PHOSfree", by Natural Chemistry. Once you get rid of the Mustard Algae (through various steps), this product is used once a week as a preventative. The way I understand it from my local pool people is that the algae lives off of the phosphates in your pool, Phosfree kills the phosphates, therefore the algae cannot live.

Per information on bottle: "Phosfree" is not an algaecide or algaestat and does not kill algae. When added to your skimmer, a thin coating of Phosfree forms on the filter and phosphates are reduced to a very low level as pool water flows through it. Extensive research has proven phosphates are the limiting nutrient (food) for algae growth in lakes and rivers, and this is also true in Swimming Pools. Natural Chemistry's complete phosphate program results in clear perfect water, no waterline rings, no chemical odors, and phosphates. Normal sanitizer levels will prevent algae growth."

I'm sure this sounds like a commercial or that I'am an employee, but I assure you I'am just a very satisfied customer. This is the second summer using this in my pool, and I haven't had any mustard algae.

Kim H. Charlotte, NC

The last resort to get rid of the algae is to drain your pool and chlorine bath it. To chlorine bath your pool all you do is walk around the inside of the pool while pouring strait chlorine down the plaster or pebble-tec. Make sure that you spend plenty of time pouring the chlorine around the lights and other places that are covered in your pool because algae could very well be hiding behind them. Once you have done this you should be able to just fill you pool back up with fresh water leaving the chlorine in the bottom if you don't have a pump to take it out. Visit This site to learn more about pool cleaning!

Brandon D. Chandler, AZ

Yellow algae is a result of a lack of chlorine in the pool. Either the pool has had no chlorine added, or the pool has become overstabilized to the point where there is not enough free chlorine to kill the yellow algae. Either way, the solution is relatively simple. For an average sized pool (10,000 to 15,000 gallons), add 5 pound of granular sodium di-chlor shock, as well as an entire bottle of a product known as AlgaTec (made by Easy Care). To prevent any algae from reoccurring, begin using a phosphate remover (such as PhosFree). Ask your pool professional to test your phosphate levels, and reduce them to less than 100ppm.

Jody - Ohio

I have an inground, vinyl sided, salt generator pool. I have been dealing with mustard algae for close to a month. After doing a lot of research, I have resolved the problem...almost overnight. As others have said, the problem is essentially chlorine levels, but adjusting to a normal level now is not going to solve the problem. Here is what I did to resolve it. I purchased a product from Ace Hardware called Yellowrid. The instructions that I followed are: 1) increase PH to a level of 8. 2) add entire contents of bottle of yellowrid as described - 1 container treats 15,000 gallons. 3) shock the pool (I didn't think this was permitted with a salt generator, but it is). 4) switch the filtration to the main drains only and allow the system to run continuously until the problem is resolved. If you have an automatic cleaner, run this 24 hours as well. 5) 12 hours after the initial shock, shock the pool again. 6) 24 hours after step 5, shock the pool again. The pool will clear up within the first 24 hours (no more sickening green/yellow color). 7) allow the pool to return to normal levels - test the water and make adjustments as necessary. Mustard algae will return in force if you don't get it all. Make sure the levels of chlorine are kept to the optimal for your system. Good luck and happy swimming!

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8y ago
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12y ago

You need to kill it first then prevent it from happening again. Brush the pool down. Shock the pool with 3 times the normal amount. Then start a phosphate treatment. When doing this treatment make sure you place everything including toys into the pool so it get treated as well. A great phosphate program is Natural Chemistry or LoChlor Starver Treatment. See your local dealers for more information!

Some times you can get it from the ca being to hi in the pool

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12y ago

You shouldn't have algae in your pool if your chemicals are correct.

I would suggest NOT swimming in it until you have had it maintained.

You will probably need to do a chlorine shock to it to kill off the algae, then stabilize it.

If the algae is too bad, then draining the pool and cleaning it would seem in order

(Disclaimer: I am NOT a pool person... just a guy who knows a little bit about them)

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8y ago
  1. Test the water for metals and use Scale Inhibitor according to label instructions if any metals are present.
  2. Establish and maintain a free chlorine or total bromine residual of 1 - 3 ppm.
  3. In chlorinated pools, add Stabilizer 100 to establish 30-40 ppm of cyanuric acid.
  4. Add 8 oz. of PowerFloc per 10,000 gallons according to label instructions. (Note: Skip this step if you cannot vacuum to waste.) This will help remove some dead algae and debris before applying the algae product. Circulate 2 hours, then shut off the pump and allow the pool to settle overnight. The next morning, vacuum to waste. If you cannot vacuum to waste and do not use the PowerFloc, vacuum leaves and debris from the pool, then brush the visible algae thoroughly.
  5. With the pump running, add 1 lb. of Burn Out Extreme or Burn Out 35 per 6,000 gallons. Circulate one hour.
  6. Add 16 oz. of Banish per 10,000 gallons in the areas of heaviest growth. Circulate 24 hours.
  7. Brush pool surfaces. Sparkle Up will help remove the algae more quickly. Wait at least 72 hours after Banish application to add Sparkle Up. Circulate 24 hours.
  8. After 24 hours, remove Sparkle Up from the filter by backwashing or rinsing the grids or cartridge.
  9. Clean the filter with Strip Kwik to remove dead algae or other buildup from the filter.
Do not swim until the free chlorine or total bromine residual has returned to the ideal range for your sanitizer. NOTE: In cases of persistent algae, repeat application after 2-4 days.
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15y ago

Drain, clean with appropriate cleaners, refill and utilize the correct sanitation chemicals in the correct quantities.

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13y ago

take a pickle and put it in the pool pickles soak up algae i would recommend that you put 12 to 13 pickles in the pool

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9y ago

I've killed all of the algae and a lot of it has floated to the top. Should I just leave my filter on and let it deal with it?

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Angie Garrett McCona...

Lvl 2
4y ago

Yellow algae in 2500 gallon pool. How do I get rid of it?

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13y ago

Buy some weed killer or clean your pool

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Q: How to Get rid of green algae in pool?
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