Hey all. Tried searchin the newsgroups were something on this but
found no exact matches to my problem. Have a dual sink with a
disposal attached to the right. If the right is slightly clogged with
food and water, I flip on the disposal to clear the drain but the left
side sink spits up like a geiser almost if I dont turn it off in time.
The stuff that comes out the left is the stuff that goes thru the
disposal I think. Not sure on the specifics of how a disposal works
but is there a drain. Is there something I can do that doesnt risk me
damaging something worse (ie:should I call a plumber) or will a bottle
of drano fix this right up. Oh and if the disposal side is fine and
draining and theres just water running, the left side doesnt fill up.
Its only when I run the disposal does stuff get pushed up the left
I have had similar occurances and every time I did it was the result of a
partial blockage past the point where the left drain and the disposer "Y"
together. It seems to happen because the disposer "throws" water forcefully
which can't get past the blockage fast enough while regular flow has no
problem doing so. I set up my plumbing so that there are seperate "P" traps
for each side which means drain cleaner in the system would never reach the
site of my clog. If yours is plumbed so that there is a single "P" trap I
guess it is possible that your blockage might be there and that drain
cleaner might have some effect (but if it is that simple, removing and
cleaning the trap manually would be easier and more effective).
To test if there is a blockage, fill one of the bowls with water.
Let the stopper out and see if the water goes down rapidly and does
not back up into the other bowl.
If it passes that test, look at how the 2 bowls are plumbed
together. If a single trap, it can use either a "center outlet"
with a TEE or an "end outlet" where one side drains staright down
and the other TEE's in from the side.
Either type of TEE should have a baffle plate inside to direct flow.
Check that it is present.
The "end outlet" setup where the disposal discharges straight down
is probably less likely to backup than the "center outlet" style.
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