Greetings. I've had a 24' above ground pool with Starbright sand filter for five years. It was used when we bought it.

I just hooked up the filter last week. It started running fine. But after several hours there was little or no flow through the system. It's not sucking in and not blowing out.
When I backwash it, it goes back to normal. But a few hours later there's no flow again. The pump sounds fine. There doesn't appear to be any leaks in the filter system. The skimmer is not taking in debris. The water is clean when I backwash.

Thanks.