Help with Basement Stinky Sink

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sburns

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Hi all

First time posting here, this site always comes up in searches and has been a great resource. Usually I've found the answer without having to create my own thread, but this time I need some more direct help.

I've been dealing with a issue in my 2 piece basement bathroom. The sink when first turning on the water will stink up bad from the drain, after a bit, sometimes the water will start to fill the sink as it backs up, then slowly drain. I've tried to add an AAV valve under the sink. It sometimes helps but not always. I may have not put it together properly. I was thinking of trying again, but before I did I thought I would get your input.

Here is the current configuration under the sink
01 basement sink 2.jpeg


Here is what I'm thinking to try next (excuse the crude drawing)
New PTrap Setup 2.jpeg



Let me know if this will work, or if you have better suggestions, or questions?

Thanks!
 

Reach4

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1. Can you lift the stopper out? If you lift out the stopper, does the sink drain slowly or does it drain better?

2. Did this work fine for a few months or more, or has it been like that pretty much from the beginning?

3. Did you put this sink in?

4. If you close the stopper, will water go down the overflow if you raise the water level?
 

sburns

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1. Can you lift the stopper out? If you lift out the stopper, does the sink drain slowly or does it drain better?

2. Did this work fine for a few months or more, or has it been like that pretty much from the beginning?

3. Did you put this sink in?

4. If you close the stopper, will water go down the overflow if you raise the water level?
Thanks for the reply.

It's always been like this. I had another config under the sink, but changed it to what is in the photo.

The drain is a pop up stopper. I can't remove it.
But when the water does fill up in the sink I can "pump" the stopper and it helps flush out the water in the sink and drain better, even while the water is running.

I put the sink in, and drain under the sink.

I haven't tried that, actually I just looked there is no over flow on this sink. My other bathroom sink has one.
 

Reach4

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AAV setup looks fine, and even if it did not, that would not cause slow draining.

What I am wondering is if your drain pipe does not connect to the overflow on the sink. The overflow on the sink should also vent the area below the stopper, and that prevents air pressure from building there. If you had the wrong drain hardware, and the water that went down the overflow but did not drain water or pass air, could give stagnant water that could develop a smell.

I am not concluding that is your problem.

If you run a soda straw down around the open stopper, does water drain better?
 

sburns

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AAV setup looks fine, and even if it did not, that would not cause slow draining.

What I am wondering is if your drain pipe does not connect to the overflow on the sink. The overflow on the sink should also vent the area below the stopper, and that prevents air pressure from building there. If you had the wrong drain hardware, and the water that went down the overflow but did not drain water or pass air, could give stagnant water that could develop a smell.

I am not concluding that is your problem.

If you run a soda straw down around the open stopper, does water drain better?
Interesting, lemmie give it a try, Iet me get back to you.
 
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