just replaced my cartridge filter with a new hayward sand filter. it ran @ 20 psi new and continues to run @ 20 psi after backwashing. everything else seems fine. pool looks great.
it also shows 20 psi when backwashing.....? it does go to 0 when the pump is off. using a Northstar 1.5 hp 2 speed. 22k ig pool.
the cartridge filter ran about 15 psi when clean.
is this too high and do you think there is a install problem?