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    Lots of sand in backwash (not return)

    Here's a puzzler from last year, which has reared its ugly head for me upon opening this year. I have a 20,000 gal in-ground pool. Hayward S-220T Sand Filter, with Vari-Flo XL valve, all powered by a Hayward Max-Flo 1 HP pump, model SP2807X10. Last year I was getting progressively more and...