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    How do I safely drain 60 year old concrete pool?

    I need to power wash and paint this 60 year old concrete pool. It has 2 manual hydrostatic valves at bottom of pool with main drain between them. I have been told by one source I need to open both of these valves before I drain the pool? Another source said I can drain the pool all the way...
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    Too much water left on solid cover after auto pumping . . .

    I am have a solid looploc safety cover over a 20'x50' inground concrete pool (1965). The pump I have sitting on the cover is a Little Giant 1700 GPH and placed in center of pool cover. The problem I am having is that the weight of the water it leaves on the cover creates a sizable drop in the...