bathroom sinks
What is the bad smell coming from my bathroom and sinks?
Anytime I use running water I can smell sewage. If I take a shower it is horrible. But goes away after 30 mins or so. What is it and how can I stop it?
I think you are correct in that you are smelling sewer gas. You have an air leak somewhere. Or you have lost a loop seal, though that is much less likely. And it may be the sewer roof vent is plugged. I have a 3br/2.5ba house. I live by myself. I rarely use the downstairs half-bath. I have to remember to put water down the half-bath sink every once in a while to keep the loop seal intact to prevent sewer gas from backing up through the sink. Water evaporates out of loop seals. It could be an air leak anywhere on the downstream side of any loop seal, but most likely where the toilet mates with the pipe in the floor. If the clamps are loose enough so the toilet can rock even if only a little bit you can not feel when it moves, it will eventually work the wax out of the sealing surfaces and leak air, but usually NOT water. This part of the pipe below the toilet is larger in diameter than the toilet itself, so the water just runs down the insides of the pipe, which has no pressure behind it to leak out of the leaking wax seal. Gravity keeps the water moving past the leak. The water has no reason to turn sideways to get out of the leaking seal. As you use the shower, you put water down the drain, which if the roof vent is plugged or restricted in some manner, will raise the air pressure in the sewer, and force air out of the leaking wax seal. So, bottom line, I think you have two problems which combined to cause your odor problem, a restricted roof vent and a leaking wax seal under the toilet.
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How to Kill Mold & Remove Bathroom Lime : Tips for Cleaning a Bathroom Sink
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