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4just1don 04-13-2010 08:22 PM

stinky kitchen sink drain
If I run hot water down my kitchen sink it stinks like terrible, I poured bleach down it and next day same stink. It smells like mold,,it is NOT sewer gas, only gets real stinky when hot is run,,cold still smells but not near as bad. Its all plastic pvc pipe, no metal anywhere till gets 20 feet down stream. all cast from there on. trap just wont let go of this stink. never backs up even a little.

plumberinlaw 04-13-2010 10:03 PM

does the hot water stink in all fixtures?

4just1don 04-13-2010 10:18 PM

no, just this one

plumberinlaw 04-14-2010 07:14 AM

you could try removing the rubber splash guard scrubbing the bottom of it, clean the inside of the disposal with a long brush, then use a bio-enzyme to clean the inside of the grind chamber and waste pipe. The smell is local to the sink unless it was plumbed without a trap

Snav 04-14-2010 08:50 AM

There's always quite a bit of drain line for one sink - so the odor can be coming from anywhere along the line. Though a partially clogged or gunked trap is the likely problem.

Having a P or S trap doesn't ensure that no odors will enter into your home through your lines from the other side - it just makes it less likely. Traps require the constant presence of water in the trap to prevent gases from coming in. The water is always present - it sits in the trap creating a barrier that gases can't get through. When you pour water down your drain it rushes through the trap, carrying the old water out and replacing it with newer water.

However, not all the old water leaves like it should. For a kitchen sink this invites the sitting water to stagnate and mold - and whatever food bits are in there will rot. Creating your likely situation.

So - if your pipes are PVC then you can try a de-clogging liquid of some sort to clear out the junk that's in the line and causing the funk. (actually, you can use it with most materials - but some get brittle and sometime are eaten through by certain brands). . . anywhoo.

If after doign that you still have a problem then you might have a slope issue in your drain line. For water to adequately drain your pipes are suppose to be higher at the in-side (under the sink/tub) and lower at the expulsion side (into the main drain line) - without this slight slope you'll likely have junk buildup - or worse.

The loss of slop also throws off the balance in your trap and will allow gases in when it shouldn't.

Of course, how to fix that is only a bridge you should worry about *if* the odor persists after a good, deep cleaning and declogging.

4just1don 04-14-2010 10:43 AM

there is NO disposal,,and there is NO clog, it drains just fine into 2" plastic that slopes well

Yoyizit 04-14-2010 03:05 PM

If there is a dishwasher drain hooked up, sometimes food gets stuck in the dishwasher pipe.

plumber Jim 04-14-2010 03:11 PM

replace the p-trap and the pvc tubular and see if that does it. and clean the basket strainers real good. can you post a picture of the pipe under the sink?

4just1don 04-14-2010 03:15 PM

no dishwasher. has tubular drain but trap is all glued in place and unable to get enough access to reglue one

plumber Jim 04-14-2010 03:28 PM


Originally Posted by 4just1don (Post 428703)
no dishwasher. has tubular drain but trap is all glued in place and unable to get enough access to reglue one

post a picture so we can see what you have and offer you better ideas.

Yoyizit 04-14-2010 05:45 PM

You could run hot water, or cold, down the drain with a hose [use rags as a gasket] for a few minutes straight and see if this changes the symptom in any way.

Snav 04-14-2010 06:13 PM


Originally Posted by 4just1don (Post 428621)
there is NO disposal,,and there is NO clog, it drains just fine into 2" plastic that slopes well

Odorous buildup or stagnating water doesn't have to be a full clog in order for it to smell horrid - it just has to be caked on the sides of the tubing enough to fester.

Draino might help eat through and clear away built-up junk, whether or not it's a solid clog.

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