I use to have a Nautilus 48 DE filter but it started to corrode when I went to a SWG. So I replaced it with a Hayward DE 48 (4820). My old Nautilus use to get pressure around 20 psi and I would backwash at 30 psi. This filter goes up to about 30 psi immediately and will go up to 40 psi after about 30 minutes. If I backwash, it will go back to 30 but then 40psi 30 minutes later.
This has slowed my flow rate down considerably to the point the SWG no flow light comes on. Now I also changed my valve to a Hayward SelectaFlo multiport valve. It is a 2' line to the pump where I use to use 1.5' with the old valve. The return pipe is now 2' instead of 1.5" but only about 4 feet.
I have a Challenger 1.5 HP pacfab pump for a 30,000 gallon pool. Is the new DE48 filter too small? is my pump too big or too small? I'm confused what's the problem.
One other thing is that if I don't run through the filter and return directly to the pool, the flow is good to the pool. It's only when I go through the pump where the flow slows down and not much circulation in the pool.???