I have a dual kitchen sink with a garbage disposal (non-working) on the right side. Underneath, the drain pipe for the garbage disposal connects to the pipe for the left side and then goes down. There is also a reverse-osmosis drinking faucet thing attached under there somewhere.
Earlier today, the left sink started draining very slowly. The right side would drain a little quicker (if I put the water from the left sink into the right sink it would drain quicker than if I left it on the right side). Later in the day, water started backing up into the left side of the sink. We've tried pouring in drano/liquid plumber but water is still filling up the left side (from the bottom up). If I try stopping up the sink/sinks, the water will come out of the pipes underneath.
Help please

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the right side. Underneath, the drain pipe for the garbage disposal connects to the pipe for the left side and then goes down.

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It doesn't go into the wall and vents out the roof? Down to what?

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the left sink started draining very slowly. The right side would drain a little quicker (if I put the water from the left sink into the right sink it would drain quicker than if I left it on the right side). Later in the day, water started backing up into the left side of the sink.

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You have a blockage in the drain line. Remove the "J" bend from the trap and snake the drain from there. Good luck, Tom

Hello Titusclan,

I agree with Tom, you have a blockage in the drian, remove the "J" bend and snake it see the images below, Thanks.

John