I'm bringing my pool back from a swamp, as I have before (with help from this forum) and having a strange issue that has never happened. After two days of running my filter the water has gotten nearly clear, but returns are only flowing for about an hour then they slowly slow down to an eventual stopping of the flow. When the pool is running well and the returns are flowing the PSI is about 20, it increases to about 30 as the water stops flowing.
As far as trouble shooting, I've done about everything: cleared out all lines with a hose blower (both directions from inside the filter, and from each skimmer), checked both of the skimmers (no leaves or any debris), checked the impeller in the small skimmer (no debris as well), opened up the filter and the grids are clean, removed the filter from the tank and theres nothing in there either.
The only thing that seems to reset things is to backwash for a short amount of time, say less than a minute. Then everything runs great for an hour and it does it again. This has lead to almost all the DE being backwashed out which would make me think should allow for even more flow, not less!
Anything I may be missing here? I'm at a loss and wasted a lot of chlorine not realizing the returns weren't even flowing.
If any pictures or anything might help I would be more than happy to snap some.