I had a bit of a mishap while opening the pool this year. While priming the filter, I mistakenly left the return plugs in place. The system wasn't running for long, and I haven’t noticed any drop in the water level, but something still seems off. Specifically, the pool vacuum has very low suction, even when set to high. The pool filters were extremely dirty, so I cleaned them, and afterward, the “low flow” light on the heater turned off, which seemed like a good sign. However, when I attempted to vacuum the pool again today, the suction was still poor. I began cleaning the filters a second time. They're from 2019, so they’re not new but don’t appear to be in terrible shape. While removing them, I noticed a hole that I’m not sure is supposed to be there.
Can you let me know if this hole is expected, and whether the low suction might be related? Hoping that it is just related to poor filters. I have a short video i can share. This is the inside of the filter