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I went back and forth to the pool store with my samples and all the chemicals are right on according to the last person that checked it. i have an 18x36 IGP a DE4820 filter (brand new) multiport valve and a 1.5 Hp pump My pool was completely green when I opened it for the first time .... in...

Hello All! I am hoping I can get some help selecting a new pool filter. I have an 18x36 inground pool, that goes 3" to 8" - maybe around 26,000 gallons. I currently have a Nautilus Pacfab DE Filter, with 1.5" plumbing. It is 36SF, 50 Max PSI, 5.5lbs of DE-- the filter is probably 20 years...