Designing a sand mound septic system in an area of high clay soil with low perc rates. I am having trouble finding a pump curve to match my design - 10' Head and 20 gpm or so. Also, should I spec a grinder pump? The pump will be handling effluent from the septic tank so in theory there should not be any solids, however the distribution pipes only have 1/4" perforations. Does anyone have experience with these systems? Thanks.
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