Answer: Unless you have a problem with your DE filter blowing DE powder back into the pool then this white powder is most likely cyanuric acid (conditioner). This is a chemical that we only need to add a few times per year. Its purpose is to shield the chlorine from the UV rays of the sun. This chemical usually takes about a day or two to dissolve. It is safe to swim in if you see this powder. If you take your brush and brush it around then it will dissolve much faster. Also, do not discard it if your Polaris cleaner picks it up in the bag, you can easily just throw it back into the pool.

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