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Here's my problem. I moved into a house with three bathrooms, one on each floor - basement, first floor, and second floor. I believe the second floor bath was added sometime in the 70's. After deciding to remodel the upstairs and gutting the walls, I discovered that the upstairs toilet drains into the downstairs stack (I believe its called a "wet vent"). My question is, how big of a deal is this? All three toilets have been operating without a problem since I bought the house (going on 4 years now.) Adding a seperate waste stack and vent would be a significant undertaking. Any ideas? I would appreciate any input. Thanks.