Seem to be having some troubles with my in-ground pool this season.
Here's my setup.
1hp Hayward Super Pump
Hayward DE Filter I think the model is 3600.
Drain on the floor in the deep end.
Skimmer at the shallow end
outlet @ the deep end.
outlet @ the shallow end.
Rebuilt the Vari-Flow valve last year.
I replaced the DE Filter fins about 8 years ago and the have no holes in them.
Pool was installed around 1991 and the pump is original.
Heres the problem.
It seems as though I'm not getting the pressure out of the outlets that I used to get. The outlet on the deep end will flow fairly well but the shallow outlet seems to just trickle after a while. I look in the skimmer and it seems as if the pull into it seems to slow as well. If I shut the pool off for a minute and turn it back on it improves and then the cycle repeats itself awhile later. I run the filter through the skimmer and the drain pulling from both all the time except when vacuuming. I've backwashed about a dozen times and added DE back into the filter but the problem keeps up. The pressure on the filter is reading around 15lbs.
Could my pump motor be going bad since it's so old? It was frozen this tear when I went to start it and I had to take it off the housing and get the impeller to spin then reinstall it, might have been some debris in it. The pump seems to run fine and im not really hearing any funny noises from it. What do you think the cause of the problem is?