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    It has been an education

    Thanks for putting this site up. Between this site and some YouTube videos, I feel like I understand what is going on. I put in a 20k gallon vinyl above-ground pool last year, with a deep end. I had no problems until about the 1-year anniversary in May, when algae sprung up suddenly and wouldn't...
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    Previously Frozen sand filter, now high pressure

    I had a similar problem, but it worked itself out. Just prior to the freeze, I drained the sand filter and pump (after backwashing), and unplugged. Pump is slightly above water level. Turned it on after three days of 70+ degree weather, and the pump is working fine when on recirculation mode...