I have 15x40 foot sports pool, 15,000 gallons
1 skimmer, 2 main drains
2 returns
All above using 1.5 inch pvc coming into the valves, Then switches after the valves to 2 inches to the 1.5hp 220v pump into the 350lb 75gpm sand filter, into pool heater then switches back to 1.5inches after...