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EC IL | Thanks for the input guys. I'll keep researching and learning. After looking at other peoples sewage setups online I'm not sure why ours has a Main line P trap...which is probably the issue.
I found a video from This Old House that looks very similar to my setup.
https://www.youtube.com/watch?v=HW-_WA1Psi8
They used a sink pump+one way check value in place of a sewage pit.
Is there a reason the old owners installed a main line P trap? If there's a clog outside I understand sewage will back up into the basement?
But wouldn't it back up into sinks and toilets if that main trap wasn't there?
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Washing Machine Stinks Up The House
