I have a 2 year old above ground pool with a hayward perflex model ec50ac filter. Last year what was happening to me was the return flow would stop after about 2 hours of the filter running. I would need to bump the handle to regenerate and it would be good for another 2 hours. I asked at the pool store and they told me that is sounded clogged. I went home took the entire filter apart and cleaned it. Put it back together - added new earth and the same thing happened. Finaly took the filter back to the store after several attempts and they gave me new guts to the filter and by this time the season was over so didnt try it again.
Now this year - new filter and all - the same thing is happening - 2 or so hours and no flow to the pool. rejuvinate and it is fine for another few hours.
I know the filter is clean. Someone mentioned to me that it could have to do with air in the line - I unscrewed the air plug on the filter - and there was air (not sure if that was normal) and still having the same problem.
Any help would be appreciated. Joe