Recent content by matthewk4

Replacing the check valve on the return line seems to have solved the problem. Check valve didn't appear to be in particularly bad shape when I pulled it out, but it must have been the cause.

That's what I suspect as well. There's a check valve there, but it didn't look great. Installed the 2/2.5 Jandy check valve as a replacement for the white PVC generic flapper check valve just now - waiting for the glue to dry so I can test it.

I don't believe so, but with so much racket when that's going on I'd need to climb up on the roof to verify that.

Vacuum relief valve at top of panels is operating normally... opens and allows air in when the panels are draining, stays shut and doesn't leak otherwise. The solar valve is a jandy 3-way valve, no modifications. So far the best guess is that the return check valve isn't working right... a...

Clear check valve on the supply side (before the solar valve) stays open, very very slight movement in time with the noise. Filter pressure is going up and down very slightly with the noise.

Plumbing setup is: pump to sand filter. Sand filter output goes to the solar valve, which in the video is off, so water then flows to the solar return T and then the gas heater and back to the pool. On the solar side of the return T is a spring check valve. No shutoff valves on the solar...

There really isn't much air coming out, but since the supply side valve seems ok the return check valve is indeed the obvious suspect. I've uploaded a video that shows the source side and then the return check valve, and then shows what happens when the pump is turned on (with solar not...

Strange problem has developed this year... when the pump comes on in the morning (and the solar panels are NOT selected), the pipes up to the solar panels knock/hammer about once or twice a second for several minutes, then settle down. I can't figure out what could possibly be causing it. Thoughts?