Generally this is an indication of a partial blockage in the waste line
going from the sink to the main sewer line. This is typically a run of 1
1/2" pipe going from behind the sink down into the basement (if you have
one), where it will somehow join the main building drain (3" or 4" pipe).
You say you "don't have any drainage problems", but what exactly does that
mean? I would guess that if you get stuff coming up in the other drain,
then the water is not running out of the sink any too fast.

You could consider running a snake through this 1 1/2 inch pipe. There
should be a cleanout in the basement, and that is a place to start. If that
doesn't fix it, snake from the sink down to the cleanout as well.


"Robert" wrote in message
om...
I recently purchased a house with a double sink in the kitchen. The
smaller sink is a couple of inches higher than the larger sink. My
problem is when I wash dishes in either sink, the soap suds come out
the drain of the other sink. It's not a big deal, more of an
annoyance, but I figure this type of setup has been around for years
and I'm sure it's not designed to work this way. I took apart all of
the plumbing underneath the sink and it's clear, including the trap. I
don't have any drainage problems either. Is there something I can do
this fix this. I only use the larger sink to wash and rinse. I'd
rather have a single sink, but it's too costly to change now. TIA.