Food put down a sink drain can quickly cause a clogged pipe, especially if the sink lacks a garbage disposal. Foods like pasta can tangle up the blades of a disposal and then harden in the pipes, causing a clog. Water can cause the pasta to swell, which further blocks the pipe. There are a few methods you can use to dissolve pasta in your sink drain without having to open the pipes or call a plumber.
Turn on the sink faucet to hot, and let it run down the drain for a few minutes.
Boil a few pots of hot water, and pour it into a larger pot or heavy cleaning bucket. Mix 1/4 cup of dish detergent into one to two gallons of boiling water.
Carefully and slowly pour the boiling water mixture directly down the drain. Run more hot tap water down the drain. Look down into the drain; you may need a flashlight to light up the drain and see clearly. Look for pasta still in the drain, a sign of a possible remaining clog. In addition, if the water continues to drain slowly, the clog likely remains. If the clog remains, proceed to Step 4.
Measure 1/2 cup of baking soda, and pour it down the drain. Measure 1/2 cup of vinegar, and pour it down the drain as well. Immediately cover the drain opening with the sink drain stopper. You may hear noise or bubbling, which is normal. The noise and bubbling is due to the vinegar and baking soda combining carbonic acid. This acid then breaks down into CO2 gases, which causes the bubbling and noises.
Allow the baking soda and vinegar mixture to sit in the drain for a few minutes. Slowly uncover the drain, and run more hot water down the drain. Repeat as needed to fully dissolve the pasta.