Hi Again, I couldnt get pressure so i filled my pump basket and turned on the pump and it worked, ran it for 2 days, vacuumed, then backwashed, turned off the pump and now when I turn it on, no pressure again. It wont filter. tried filling the pump basket again and it still wont work. I have a Large hayword series filter 50 psi with a a.o.smith 1.5 hp pump.. is it the size of the pump?????