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So we have a Hayward sand filter. We had sand pumping into our pool so we replaced the lateral assembly, since then we have great pressure that last about 20-30 min then it starts dropping. we have checked out lines and primed the pump and still cant get to the bottom of the problem. Any help...

Ok so I cheated and had the pool store test my water here are my results cya 70 free chlorine 1.5 ph 7.6 tot alkalinity 100 adj tot alk 79 total hardness 117 I have a kayak pool that 16 x 24 4 fiit deep it holds app 11500 gal I use liquid bleach to...