Quick question: Recently purchased a home with pool (see stats below). Just cleaned the filter cartridges of the my Sta Rite 3 300sqft dual cartridge system - and they were really nasty. Maybe 1.5-2 yrs since they were last cleaned. Cleaned cartridges, Overnight/15hr soak in Cascade, look pretty good with some minor staining near top. Skimmer is clean. Removed the diverter (it floats) and PSI did not change.
The PSI prior to cleaning was 15 (then spiked to ~22 after fixing some pump wiring).
The PSI after cleaning is 6-7 PSI (new gauge)/zeros when off.
Filter is 1/2 HP single speed Sta-Rite PE5C-180L. Lines in and out of the filter 2". When the booster pump is running, it drops by about 2PSI. Skimmer & drain lines are 1.5" copper. Return line to the pool is 1.5" copper. Two returns in the pool, both appear smaller than 1.5" (haven't measured them yet) - no fittings.
All lines in ground are copper (old pool - 50 yr+!)
1.5" Skimmer/Drain - Pump - 2" Check Valve (broken spring, but open) - 2" Inlet/Outlet Canister Filter - 1.5" Heater - 1.5" to Returns (With 3/4" split to Booster Pump).
Question: Is the main pump motor undersized? Is my filter PSI too low?