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My DE filter is a big steel 48 sq ft KDDI model that I think must be at least 20 years old and the clamp sometimes leaks . Local guy has a Hayward DE4820 ProGrid D. E. Pool Filter, 48 square foot, vertical grid hes letting go cheap.. i have a Pentair SuperFlo Variable Speed Pump 342001 I bought...

I cannot seem to keep chlorine in the pool.Please review the last 48 hours below . I live in philly its been overcast / sunny for the last 2 days and hot. Sunday 9am FAC .5 TAC 1.5 ph 7.4 TA 80 CYA 40 Calcium 240 Total dissolved solids 1300 so the recommendation was to shock the...