Sewage ejector system noise and joint separation
I have a problem with my basement sewage ejector system that has puzzled the first pluber and contractor I've brought in for help. The problem ultimately presents itself with a very violent water hammer sound when the pump shuts off, and along with that the pipe and rubber joint above the check valve speperating and releasing raw sewage into my basement mechanical room (this is very enjoyable). I had the septic tank emptied and verified when the ejector pump runs waste water does freely flow into the septic tank. Could this be a venting problem? (We live in Michigan and the temps have been below 20 degrees).
When I had the contractor and plumber in the first time, the theory was the hammer was moving the pipe so much that the rubber connection between the exit PVC pipe and check valve was working itself loose. Extra hose clamps were added and the exit PVC pipe was more firmly connected to the walls to minimize movement after the pump shuts off. This has worked OK for 2 months.
Last hint is we only use the basement on the weekends for the most part.
Thanks for any help