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Also warm water, and chlorine below 1 ppm contribute to algae growth. If there is a high concentration of phosphates in your pool, you can get algae even if chlorine is higher than 1 ppm. If you see algae, take a sample of water to a pool store and have it tested for phosphates. Generally, if you have more than 200 ppb of phosphates, it should be treated. Do not let store convince you to buy phosphate remover if results are under 200 ppb. It's not necessary to treat at that low level.

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