Have not had any issues for last 2 years but now I am getting air trapped in my SWG. Please see attached photos.
My pool is really small 12'x26' 26000 gal.
PUMP- Pentair 340038 SuperFlo High Performance Single Speed Pool Pump, 1 Horsepower, 115/230 Volt, 1 Phase (No air bubbles in basket)
Pentair clean and clear plus cartridge filter
My equipment is above water level
3 return lines 2" pipe and 2 intake lines 2" pipe
3 returns (2 have valves, 1 is for waterfall feature, 1 is for return jets shallow end) 1 return for deep end, no shut off valve on this return.
I have purged the system with pressure relief valve on top of cartridge filter but it appears that my SWG is at same height as the relief valve and that may be why air getting trapped in SWG.
If I shut down the pump everything is still under pressure from the check valve installed before pump and it stops water flowing back into pool.
If I let it sit for 5 minutes and turn pump back on the pressure clears out air in the SWG.
After a day or two there is air back in the SWG and no idea where it is coming from as there is no air bubbles in the pump.
If I open pressure relief valve on cartridge filter, water only comes out, no air.
There are no leaks and I have no idea what is going on.
My only conclusion is that air is getting in before the pump but the pump is sucking it straight through to the cartridge filter and the SWG may be mounted a few inches higher than filter and that is why air is trapping there.
Poor design of SWG when input & output flow is on bottom.
Thanks, I hope I have provided enough info.
I removed the blue plastic cover and took a video