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New (to us) house...new (to us) pool. I have a de filter. My valve says "for sand filters only!" Why is it that some valves are made only for sand filters? What am I risking by leaving it in place? Sent from my iPhone using Tapatalk

25,000 gal pool Free chlorine drops by approx 2 each day Combined chlorine is almost nonexistant Just switched pool from tabs to bleach last week ph at 7.8 consistently alkalinity at 130 calcium at 210 CA at 40 I'm using 2-3 gals of bleach each evening. It pushes my chlorine up to 5 or 6. It...

We are moving into a new house this weekend. It has a pool. It was literally YEARS ago that I last took care of a pool (although, ironically, it was with liquid chlorine on some sort of "dripper" that I could adjust). I've read Pool School at least four times. I've bought a REAL test kit...