I'm helping out my wife's friend with her 25K vinyl in ground pool that is approximately 8 years old with 2 skimmers, 3 returns, no main drain and 1 1/2" plumbing. She had a Jandy pump that was shot.
So I replaced it with a Hayward VS super pump. Great unit btw. The installation was pretty straight forward and I used 1 1/2" PVC unions on both sides of the pump. Got the pump up and running and noticed that the Praher SM20-2 multi-port valve was leaking to waste. So I swapped out the internal gasket (major PIA as it was glued in) as well as the cover O ring. Lubed everything with a light coat of silicon grease. That fixed that problem. I also cleaned the Jandy DEL48 DE filter that was a real mess. Added 5lbs of DE in a slurry. The start up pressure is within spec with the pump running at full speed.
OK so here is the issue(s);
1). It takes forever to purge the air out of the DE filter and it drains down when the pump is shut off. Is this normal because the equipment is above the level of the pool ? I don't see a check valve anywhere in the system. There is a heater but no auto-chlorinator. I also hear what seems to be a gurgling noise inside the multi-port valve.
2). Can't seem to purge some air out of the pump basket. I believe this may suggest a leak somewhere on the suction side.
Thanks in advance for your suggestions.