zappaan, thanks for the input. If you go back to page 8 of this thread you will see the valve configuration. I put a variable speed pump on a couple of months ago, and everything from 6 inches above the ground up is new plumbing. Unfortunately where the PVC 2 inch lines come up, they are encased in flagstone. This is separate from my cement pad my pumps sit on so it shouldn't be that hard to break up. Based on that skimmer line providing water to the pump at least enough to operate, the fact that when I tried to backwash it and it would not let anything past the other direction and it also stayed full of water, I have to believe there is a check valve. If it was so obstructed I could not get anything at all to pass backwards, I find it difficult to think it would flow to the pump as much as it does. If there is indeed a check valve close to the surface, then I would not be so nervous about running a snake. Is it possible that a 1.5 inch PVC line 40+ feet just does not give up enough water by itself? Obviously it gives up enough water for the other skimmer and floor drain intakes, but they are probably twice as close to the pump.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk