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Why are flocculants bad with cartridge filters?

live up here in New England with an in ground pool, opened 2 weeks ago. Its balanced but blue. I shocked it a couple of times and I still see vague shadows in the deep end which just stays foggy. I have brushed the pool a few times and there isn't a hint of green. I have a cartridge filter and...

I have Hayward SwimClear. I have cleaned the cartridges 5 times since the start of the season (mid June outside Boston). PSI still reaches 20 within a week. My pool guy suggested that before I junk the cartridges I try cleaning them by soaking them for an hour with muriatic acid.I am a little...

The house I moved to 22 years ago had a pool and I have kept it up ever since. Up until 2 years ago I used a DE filter. The original owner was a do-it-yourself kind of guy and the filter just drained to the back of the cabana. So for 20 years i have been buying bags of DE and...