I hope I can be as informative as possible with my pool problem. We recently moved into our house and proceeded to reopen the in ground pool here. The pump was junk so we installed a new pump. We hooked everything up and had no suction at skimmers or water flow from jets. The pool was green as grass. We added shock DE and bleach. We also scooped out multiple frogs and chipmunk from the pool. We had a Hayward Perflex filter with the bumper. It seemed to have it's time probably 25 + years and purchased a new Hayward ProGrid DE 326c filter. Hooked all new plumbing and pump up. It worked for 3 hours.
Today we attempted to vacuum and can only get good suction from skimmers while in waste setting. Earlier this morning we removed the filter cleaning element and it was filled with debris cleaned it out put filter back together and vacuumed pool again on waste setting. After 15 mins pump basket was filled with leaves and pine needles. We put filter valve back to filter got about 5 mins of jet pressure but little skimmer suction. Filter pressure maintains 20 psi. Is it time to call a pool technician?