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I have a Hayward S200 Sand filter and recently replaced the sand. Took old sand out, added water then the new sand (200# as the specs indicated). It's been a few weeks and everything seems ok unless we backwash or have the filter turned off for a time. As soon as we turn back on to filter, we...

I have been losing water when pump is on-overnight on filter, lost about 3 inches. I don't see any leaks around the pool, but there is water coming from the waste pipe when on filter. After reading some other posts, I checked the spider gasket in the valve, looks good-no cracks, not coming...