We got our pool mid-season last year. 16x34 vinyl with Pentair equipment (FLT FNS PLS36 DE Filter, Superflo SF-N1-1A pump, Intellichlor Salt Generator, and Mastertemp 250 Heater). Last season we had good suction in the skimmer, noticeable suction that held the basket down. The return jets (2 of them) had good strong pressure. The PB took the filter guts to the shop to clean them during the off season. When the PB opened the pool this spring (we’re in Western PA) things seemed fine, but the skimmer didn’t seem as strong nor did the returns. We had a lot of pollen so they came and cleaned the filter. Things still seemed weak, but the PB didn’t seem concerned. This morning, without making any changes or doing any maintenance, the jets were easily 5x as strong and just visually looking as the skimmer you could see it moving much more water. My filter pressure also dropped from about 25 (where it started the season and stayed constant) to around 16. What would cause such a dramatic change in pump performance? Something large stuck in a line? We have a skimmer and floor drain and two returns.