I went and bought a new sand filter without looking up what I should have really gotten. I bought a 100# filter. With my previous filter and now with this one, I keep getting fine silt on bottom of pool. I assume it is coming from filter, since while I vacuum and the pump is on high, i see it slowly collecting again behind me. If I have my pump on low speed, accumulation is alot slower. I have a 2-speed 3/4 to 1Hp pump. Today, the pump had been on low speed and I kicked it up to high speed, and a cloud of dirt came out of return. There is brand new sand in filter too.
Am I just filling my filter up too quick and just need to backwash more ofter? Did I buy too small filter? My pressure never increased with all the silt in filter.... Pool is about 10,000 gallons