Hello and thanks for reading this. I have an older Hayward system (I didn't build it) and I think I might have a problem. The pump basket (image 1) shows a lot of swirling, the filter housing collects air (after completely draining the air, it takes just a few minutes for some air to re-collect). The psi is around 4, no air bubbles in the pool, system primes itself just fine and seems to hold suction when turned off. I noticed two the pipe connections on the bottom of the skimmer, but they are quite small, maybe an inch each and one doesn't have any suction.
It looks as if the pump would just not get enough water. And I was wondering why there are two pipe 'holes' on the bottom of the skimmer with only one actually sucking water.
Any hints are appreciated.