I've had two pool guys come out to my house and neither of them have been able to solve my problem, so I thought I'd ask the REAL experts...wakeboarders!
I have a regular paper filter system (Pentair) that runs at about 10 pounds of pressure and when it gets up to about 20 pounds, I take it apart and clean the filters. For years I only had to do it a few times a year.
Lately it's been doing a couple of strange things. The first is that it will act like the filter needs cleaning (pool vacuum slows down, water flow slows down), but instead of the pressure increasing, it decreases down to about 2 pounds. It also occasionally behaves correctly where the pressure will go up as if the filters are clogged. However, I know they can't be clogged because I just recently cleaned them.
For example, I cleaned the filters yesterday and it worked fine all day running at 10 pounds. However, today it is running really slow and the pump is at 25 pounds. Last week, I cleaned them and they ran a few days before the pressure dropped to about four pounds.
I know my description is very confusing because it sounds like there is more than one thing going wrong, but I'm at a loss. I can't believe these pool guys don't have any idea what's wrong. Any input would be appreciated.