Can anyone offer a troubleshooting guide for DE filters? For instance, what are the symptoms of too much powder? Too little powder? What should the filter pressure be? And so on.
Here's my situation. I've got a Hayward Perflex EC65 DE filter, and a Hayward 3/4 hp SuperPump. If I turn the pump on in the morning, by late afternoon I've got no flow through the filter. If I bump the filter (regenerate, I think they call it), I can get several more hours of good flow. So I think the filter needs a new batch of powder, so I follow the instructions and backflush all (or most) of the powder, then add some more powder to the skimmer. The exact same thing happens, no flow after several hours. Bear in mind the water is crystal clear during all this time.
So, I disassemble the filter, completely clean the filter housing and the fingers. This thing is like new at this point. Ressemble, add the recommended amount of DE powder, and within 6 hours or so, the flow is once again negligible. The pressure when freshly assembled is about 23 pounds, and when the flow stops a few hours later the pressure is 25-26 pounds.
I'm at a loss. Any ideas?