Thank you for the great resource here...learned a lot reading already.
I just opened my pool and cannot get my water to clear. I pulled a bucket of return water and it is still cloudy AFTER being filtered. In the past my return water is sparkling/crystal clear. Normally the pressure rises quickly when clearing the just-opened water. Pressure is VERY slow to rise (~2psi--7 to 9) after a couple days of running. Usually I see a 50-100% increase in 24-48 hours of the early-season clearing. I know my system...it can go from pea-soup to seeing the bottom of the shallow end in <6 hours. And total clearing in a couple days. We're at 4 days and I still can't make out the bottom in the shallow end.
- ~20k gallon in-ground vinyl liner
- superpump (older but i rebuilt all seals, etc 2 years ago)
- variflow multiport (new spider gasket last year)
- hayward DE4800 48 sq ft DE filter (~20 years old); grids have only 3 seasons of use.
What I have done:
Took the filter apart and cleaned the grids. Once at startup and then again to check for tears/holes/cracks etc. All were fine both times.
Replace the Z5 oring on the inlet elbow in the DE4800 (top of the filter manifold to the return line I the filter. It looked a little worn and I was grasping at straws. No help.
I took apart the multiport. The spider gasket is fine and it shifts modes very smoothly.
Backwashed and recharged filter several times between disassembly of the filter. It is running at 7.5PSI recharged on very clean grids. This is slightly (maybe 2psi) lower than I remember the charged clean-grid pressure usually.
Water is somehow bypassing the filter elements...but I cannot find where?!?
Anyone have any suggestions of what to check next? I'm out of ideas!