so you dont see an issue with tying in the upstairs saniflo into the vent stack down on the first floor but just above the washing machine and sink drains on the first floor? would this help avoid any risk of negative pressure in your opinion?
I do think I will need to vent the saniflo pump...
I am adding a room in my attic and would like to add a bathroom upstairs. I can get water supply there but the drain is the difficult part. I have an air vent from my downstairs laundry nearby I could tie the saniflo into but I worry about negative pressure issues on the ptraps below. I don't...
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