Answers:If a sink has the proper drain plumbing, every bowl may have it really is personal trap beneath the sink. The goal with the trap will be to trap drinking water to reduce gasses through the sewer line from reaching the residing spot. a further purpose they serve will be to clog the drain line just before tough content will get farther down the drain line where by it truly is more challenging to attain and eliminate. So, if the two your sink as well as your upstairs neighbor's sink have S traps beneath them, i might guess there is definitely an unusual/inappropriate slope or kink from the drain line inside of the constructing that is certainly trapping content that is certainly passing as a result of your S traps beneath the sink. for those who are renters, request the landlord to look into this dilemma. If he would not do this, you require to start looking right into a an individual way valve to suit your needs drain pipe, ideally set up around the stage it meets the prevalent drain line.
Flotec tends to make a check out valve for in between $10 and $20
Answers:Tell the landlord. His task, not yours.
