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Read some differing opinions on this... 200 minimum, or it doesn't matter I have an old pentair 125 heater that is well out of warranty CH in above ground pool (vinyl) is 118. Also has SWG. Water in area is naturally quite hard and I've filled quite a bit this year due to repairs and waste...

Hi all, First post here looking for some help. I want to verify the best thing to do given my situation, hope I could get some feedback. Background: 1) Approx 30k gallon kidney pool - sylvan from 70s, two skimmers. Water about 1.5" higher on one end than the other. 2) 70s hayward sand filter...