I've been highly suspicious if my sand filter that I purchased last season is working properly. At first it seemed to work well but halfway through the season it seemed to stop filtering properly. This season I opened up to a pretty dirty pool. I've been running the filter 24 by 7 for two weeks and I still have large particulates visible with the naked eye floating in the water and not near clean yet.
I just noticed that in my saltwater cell there are hairs that have gotten caught in the cell (there was a dead squirrel on the bottom of the pool... gross I know). This makes me wonder if that is the definitive proof that the filter is not filtering properly? Shouldn't the hairs be too large to make it through the filter? I have backwashed and don't believe that is the issue, however I will say that backwashing did not drop the pressure much (but maybe it didn't need to be). Back to the hairs in the salt cell. Is that definitive proof or is it normal for something that large to pass through?