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ok i have a 1.5 hp 19 inch hydro tools sand filter. 21 foot round pool 52" been having alge problems thats why i started looking into the flow rates. Pump is rated at 75 gpm and the filter is 40 max. I been running 50 foot of pipe 2" pvc on suction and return with about seven long radius 90s...

IF I have 3" of water collum on the suction side of my pump, that converts to about .25 inches of mercury. Does that mean the piping and everything is in good shoes. I mean if the pump was sucking 14 inches of mercury its wrorking really hard. So Little to no vacuum on the drain port is a...