Thanks for your help. I have an intex pool 22' x 52", a - 1 hp Hayward pump, and a doughboy sand filter that I believe is several years old: http://www.lomart-parts.com/manuals/...STR1926_97.pdf
I bought it used last year and used it six weeks before we closed pool. I thought it worked fine. I took it apart today to look and see if the laterals were clogged. It actually doesn't have laterals but more of a "lower deck" I think it's called. I found some odd things- found some debris like hair was actually sucked down into the sand several inches. I think there was some gummy debri in the intake on the lower deck- something like maybe the Molykote 111 that I used to coat the o-ring between the valve and the filter housing. I didn't have the tools to unscrew the nut to pull out the lower deck, so I'll have to examine that tommorrow.
I can't determine from the manual I've posted above that the 1 hp pump is too large.
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