Hello,

New here and have a question. Please bear with me as I have no knowledge about plumbing.

Double kitchen sink with disposal. When sinks are empty, there is no problem, I can have the water on at full blast without problems. However, when I dump a pot full of water in at once, 1) the larger sink drains very very slowly without sound, 2) the disposal side sink drains fast but with alot of bubbles and gurgling. Tried drano, snaking, took apart pipes, nothing worked.

Finally called a plumber. He put a vent onto the drain pipe under the sink. Problem resolved. However, it is happening again. Exact same thing. Plumber not responding. What can I do?

Thank you

if you mean the plumber put an AAV (studor vent) into the drain, that will do absolutely no good. they only help after the water has passed by them. they do nothing to relieve a positive pressure.
can you post a picture of the under sink plumbing ?

Obviously, the problem was NOT "Solved", and you need a better plumber.

I hope i did this right. The vent is attached to the pipe all the way in the back. Thank you!

that all looks good to me.
i have no idea why you are having this problem.
someone needs to be there and do a couple of tests.
you could try unscrewing the AAV and see if that helps?
i might at least give us a clue..

I'll ask an obvious question.....Did the plumber dis-assemble the trap and make sure it is not full of debris from the disposal?

Curious, what is the blue tubing that appears to be tapped into the drain after the p-trap with a saddle clamp? Some sort of condensate discharge?

that is usually a discharge from a reverse osmosis system.
in fact I did see it but did not pay attention to the fact that it must be connected to the inlet side of the trap not the outlet side.
it will function just fine where it is bit if in the future someone disconnects the RO filter then sewer gases can enter the house thru that 3/8 tube.

Some guys install the RO drain after the trap so you don't hear the waste water trickling in........

Hello,

I removed the vent cap and voila, drains fine. Replaced with a new vent cap, and not working as well. It drains better than before, but still slower than when i had the vent cap completely off. Will replace with a completely different brand and see if that makes a difference. Thank you all for your help. This forum is great!



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So with that added vent pipe totally open to the air, everythings fine, but when you add the AAV on it, you get issues.

Might this indicate a positive pressure issue including for example a double trap situation?



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