I am also using hard PVC. Bu my tank is upstairs and I am rarely up there so the noise doesn't bother me. I guess we will see if that changes the beginning of next year when I move everything down stairs.
Working with one drain sucks.i have this problem to but I can't do anything about it, ideally you would want one full syphon drain adjusted with gate valve and a second drain where water barely goes through for an emergency if valve /drain gets clogged.a full su phone 1 inch pvc or flex you wouldn't hear the water noise. Is the noise where water enters or exits?
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