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Hi, I want to change the sand on a Hayward S200. What would be best way to access the sand? Would I take the small top access dome off or take the large top half of the filter dome that has all of the bolts on it off? I imagine if I take off the big filter dome I would want to replace the large...

Hi everyone. I have been reading the posts on the site and decided to join. I take care of 2 pools the Park District in Grand Forks ND. One pool is 500,000 gallons and the other one is 256,000 gallons. We use bleach for the sanitizer and acid for PH control. Our season is short in ND the 2 pools...