I'm a new owner of an old pool so I'm very new to a lot of what goes on with running one.
I went through the opening of the pool at the start of the season in May, which seemed to go okay but I noticed that I needed to vacuum the pool out again a lot quicker than I thought. I went on like this for a while then noticed that the inlet was throwing dirt back in to the pool and has been getting worse since. So I changed the sand, checked the laterals and replaced the spider gasket (which was extremely worn). Because I had to wait a while the pool didn't get pumped so it went green but I've been able to get that back to a cloudy blue.
Unfortunately the pool is still not filtering correctly. I've just tried to vacuum it which started out fine but after a minute or so the pump began struggling and the pressure dropped. I turned it off then back on again and it threw everything back into the pool via the inlet and the pressure returned to normal. It may be worth noting that I had a problem priming the pump so I flushed out the skimmer pipe a few days ago and then it primed fine.
Is there something else I should check?