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It may seem to get rid of the green temporarily, but the actual spores on your liner are clear, and live algae will simply circulate – filters don’t kill anything. Clarifiers are available to speed up this process, however, they can create a gummy residue in some filters so it is only recommended after your filter has been given an opportunity to clear the water on its own. Continue to run the filter 24 hours a day, backwash every day, until the pool is clear. IT IS YOUR FILTER’S JOB TO CLEAR THE DEBRIS floating in the water. The dead algae floating around cause the cloudiness. When the algae is dead, you will probably wind up with milky-white cloudy water.
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If the chlorine level is allowed to fall, the algae will begin to reproduce and proliferate, and it will take even longer to kill. You must maintain that high level of chlorine. You need to raise the level of your chlorine – shock the pool – and maintain that high level until all the algae is dead. The only thing that kills algae is CHLORINE (or your sanitizing product, or one of the copper-based algaecides on the market). Algae thrive in warmer water – so if we’re having an unusually warm summer, algae will grow more quickly, and regular chlorine levels should be maintained a little higher than normal. Rain can bring in spores, algae and dirt beyond what the current chlorine level can handle. Many things cause green pool water, even if you’ve maintained perfect water conditions. Although vacuuming seems to clear it up easily, it grows back rapidly. Most water testing cannot detect algae, so although your water tests may come out OK, if you have green, you have LIVE ALGAE. If a pool is green, or has green (or possibly yellow or brown) spots on the liner or concrete, you have LIVE ALGAE.
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Adjust pH and alkalinity when algae are gone and chlorine levels have fallen to a safe range for swimming. Run the filter 24 hours a day and backwash every day until the green and then cloudiness is gone (usually up to 7 days, sometimes as long as 2 weeks depending on the filter). Shock the pool with chlorine every day until all the green is gone (possibly 3 to 4 days). Simply follow the steps outlined below and eliminate the green and bring in the blue! Luckily, the solution to the “green pool” problem is not that hard to solve and with proper maintenance and pool attention, you will be enjoying a crystal clear algea-free pool once again. One of the most frequent and annoying situations for any pool owner is an ugly green pool.