We are in South Alabama, USA and for 27 years we have had that same sediment on the bottom of our pool. We have to run our Polaris vacuum continuously just to keep the pool from looking dirty. If we run the pool without the Polaris, in 2 short hours the pool bottom is covered with that fine sediment. I can backwash every single day and the water is brown. It‘s never ending and 2 different pool companies could not help me. We have had 3 filters and 3 liners and 3 Polaris vacuums changed out and nothing has made it go away. I am to the point where I am going to fill in out 39000 gallon pool.
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Sediment can be several things. Algae, dirt/dust, pollen, etc. The first place we would start is with a full set of "reliable" test results. We'll let you know now even pool store testing is commonly flawed, and so is their advice. You would be best served to obtain a TF-100 (link in my signature) or Taylor K-2006C tests kit first, then post a full set of those results. That's how we base all our advice form this forum.
