Hi all. I finally got my Stenner pump installed at the pad tonight.I threaded the injector/check valve assembly into the T that I plumbed in for it, and turned the pool pump on before hooking up the hoses to make sure it didn't leak. To my surprise, water slowly bubbled up the injector tube. Is that normal? I suppose if water were to travel back up my tubes, the Stenner itself won't let the water back into my chlorine storage. But it seemed to go against what I know a check valve to do.