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Because one of the pipes underneath is plugged. Release the whole pipe section from both sinks and clean it out.

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11y ago
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15y ago

is could be a waste line problem where the gradient is wrong or your sewer line may be blocked somewhere Stoppage down stream

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14y ago

You have a slow train. Call a plumber or get a pipe snake and clean it out. You can also pour baking soda and boiling water down the drain to help keep it clean.

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16y ago

your sink drain pipe(s) need cleaning

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12y ago

clogged drain

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Q: When using garbage disposal the water backs up into 2nd sink why?
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Related questions

Are you supposed to run water while using the garbage disposal?

Yes if you do not you could break your garbage disposal.


How can you get water to flow down your garbage disposal?

turn it on


Should you use hot or cold water down your garbage disposal?

no


Do I use hot or cold water when I run my garbage disposal?

Both


Newly installed garbage disposal leaks from small factory holes in bottom of unit. Pipes don't leak...connection does not leak...what the heck. Only leaks when disposal switch and water is on.?

Defective garbage disposal.


Why do you need to have water continually running while using a garbage disposal?

The water assists in chopping up the items being chopped and washes them down the drain to prevent stoppage.


Garbage disposal sharpening?

Put ice cubes in disposal and run water as usual until ice cubes are shredded.


Why does your garbage disposal stink?

It possibly has garbage trapped in parts of it or the tube right below. Fill the sink with hot water and drain it through.


Can you put spinach down the garbage disposal?

You should be able to as long as you use enough water both while using the disposal and after to make sure it all goes down the drain. While zucchini skin is tough, it doesn't have fibers or strands that could bind up on the cutting knives in the disposal.


does the outlet for the dishwasher have to be on the same side of the garbage disposal drainage outlet?

Yes the outlet for the dishwasher should be on the same side as the disposal,so the disposal can handle the waste water from the dishwasher.


Where can I purchase garbage disposal online?

InSinkErator offers quality garbage disposals, garbage disposers, water dispensers, hot water dispensers, home water filtration system, food waste disposers ... Instant Hot Water Dispensers - Household Disposers


How do you deodorize a garbage disposal?

To deodorize a garbage disposal you can either put some baking soda in the drain and let it sit for a while or my favorite is to run lemon peels through the disposal after you do the dishes every night. You can use orange peels, too. Just make sure the pieces are small enough to run through without clogging it.