Loud smelly sink drain

shadetree · Jan 20, 2007

The drain in my bathroom makes a loud hollow thumping noise, only when the electric hvac heat pump cycles.
I periodically have to pour bleach down vent drain to eliminate a foul smell.
I have replaced p trap twice smell continues to return. When I removed the trap, there is a black slimy film covering on the inside of pipe.
What can i do to repair this problem? My house is two story and six years old. Problem happens in first story master.

Thanks

Leejosepho · Jan 20, 2007

shadetree said:
When I removed the trap, there is a black slimy film covering on the inside of pipe.
What can i do to repair this problem? My house is two story and six years old. Problem happens in first story master.

Believe this or not: Spitting mouthwash into the toilet rather than the sink will greatly reduce that black slimy stuff. I do not know all the science here, but your trap is slimy and smelly because it is too clean!

Sponsor · 2022-01-29T12:20:58-0800

Plumb or Die · Jan 20, 2007

What kind of furnace do you have. Is it a high efficiency one that uses 2" plastic pipe for the chimney? If so, is ths chimney piped into the venting system for your plumbing? If it is, it's probably siphoning the trap in your sink dry, thus the smell. But that's a lot of assuming based on very little knowlege of your situation.......

Cass · Jan 20, 2007

shadetree said:
The drain in my bathroom makes a loud hollow thumping noise, only when the electric hvac heat pump cycles.
I periodically have to pour bleach down vent drain to eliminate a foul smell.
I have replaced p trap twice smell continues to return. When I removed the trap, there is a black slimy film covering on the inside of pipe.
What can i do to repair this problem? My house is two story and six years old. Problem happens in first story master.

Thanks Charles

Here in the US you are not allowed to tie the plumbing system into the furnace combustion air vent.

Even if it were it could not possibly suck the trap dry unless the vacume from the furnace running was greater than the incoming air through the outside plumbing vents and there is no home furnace that I know of that would do that

Plumb or Die · Jan 21, 2007

You can't in Canada either. And you must properly size and engineer your DWV systems, just like the States. But some pretty weird stuff still happens in both of our fine countries.

Markts30 · Jan 21, 2007

shadetree said:
I periodically have to pour bleach down vent drain to eliminate a foul smell.
I have replaced p trap twice smell continues to return. When I removed the trap, there is a black slimy film covering on the inside of pipe.

There was a post here recently about overflows in lavs and liquid soap...
Think that that might be your smell....

Loud smelly sink drain

shadetree

New Member

Leejosepho

DIY scratch-pad engineer

Sponsor

Paid Advertisement

Plumb or Die

Plumbing Instructor

Cass

Plumber

Plumb or Die

Plumbing Instructor

Markts30

Commercial Plumber

Similar threads