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For the past couple months I have noticed this on the bottom of my above ground pool. I believe the liner is vinyl. My chemistry ( taken weekly from a Taylor kit) FC: 9 TA: 70 CYA: 50 PH: 7.4 CA: 70 It is a 12000 gallon 24 ft round pool. My weekly strategy is to backwash my sand filter...

I recently drained and refilled my 12000 gallon above ground pool 24 ft round due to a cya value of 130 ( determined by taking sample to pool store). I drained 3/4 ish. After refill, I ran pump/filter for 24 hours and then sampled. this is my chemistry Ph = 7.2 Ta= 50 Hardness = 60 Free...

24 ft round above ground pool With a chlorinator at the discharge of sand filter. I purchased a house with a pool in November so the first time of operation for me has been the last week. Water line is roughly 1/4 of the skimmer opening. Recently I have been noticing slight backflow from my...