The Other Mike wrote:
We keep experiencing water backing up into both sides of the sink. there didn't seem to be any clogs. If the sink is backed up, I'll run the disposal and water will
disappear from that side of the sink but come up the other side. The
only way to get the water down is to plug the non-disposal side and
use a plunger on the disposal side and do this about 1/2 dozen times.
It almost seems like there's some kind of vacuum occuring but I'm not
much of a plumber and don't know what to do. Any advice on what could
be happening?

You say there doesn't seem to be any clogs but what did you actually
check? first of all, check the trap. it is the part underneath the
sink which is U-shaped and is designed to be easily dissasebled without
tools. It is A clog could be there but probably not. You check it
first because it is easy to check.

Downstream from the trap, underneath the sink, there should be a
fitting called a cleanout. It is designed so that you can check the
line for clogs without having to go through the sink or the trap. You
get a tool called a snake which is a flexible wire coil that can be
pushed through the line to check for clogs and to pull them out. Most
clogs are hair, food, baby wipes, sanitary napkins and the like.

I have cleaned a few lines out in my time and at one place I pulled out
seven such clogs, mostly hair. I have a 50 foot snake. At anothere
place we had to end up calling a real plumber who used a tiny camera to
look into the line. It was determined that the clog was tree roots
growning into the line between the house and the street. they had to
dig up the yard to fix it. good luck.