This is going to be a really stupid question, but being winter with the pool closed up I was just thinking about it today and figured I would ask. My old pump burned up last september, I ended up having to replace it. This got super involved, old wiring was dry rotted, plumping wouldn't match up, etc. I replaced my old generic pump with a Pentair of the same HP. The filter was extremely dirty, my PSI over the summer was around 6-8PSI, and by the time I got it back running (a few weeks after it went down) it was up around 25-28PSI. I am guessing sitting around drying out didn't help...
So long story short I needed to vacuume my pool before closing it and noticed very low suction. I could tell it was bad when I dropped the vacuum into the skimmer I could pull it out myself with it on.
I thought at the time that when the PSI went up it meant the water needed more pressure to keep flowing at a normal rate. But now I am not so sure. I am buying a brand new filter before opening this spring and hoping that's all it is. I am worried if its not the filter I should of went up to a larger pump.