How Do You Unclog a Two-Sided Kitchen Sink?

To unclog a two-sided kitchen sink, plug one drain, use a sink plunger on the other side, then move on to a baking soda and vinegar flush, a wet-dry vacuum, or an auger if the clog is deeper in the shared drain line.

One of the last things we think about is how the sink drains. At least it is until it stops draining. How do you know what to do when that happens?

You can call a plumber first thing, and when you’re looking for plumbers in Ashville, NC, Four Seasons Plumbing has licensed and trained technicians who will ensure all your drains are flowing smoothly.

However, if you want to try to unclog it yourself, here are some tips that will allow you to do some of the troubleshooting on your own. One of the main items you need to consider is that although you may have two sinks, both sinks drain into the same drainpipe.

How Do You Start Unclogging a Two-sided Kitchen Sink?

First, try running hot water down the sink to break through the clog. If that doesn’t work, you may want to try a baking soda mixture of one cup of baking soda poured into the drain, followed by one cup of white vinegar. Wait 15 minutes and follow that with hot water.

Use extreme caution when pouring hot water down your sink. Most sinks use PVC pipes, which cannot handle high heat. The water from the tap doesn’t get hotter than the pipe can take, but if you use boiling water, you could damage your pipes or the glue of the seal around the pipes.

Here are the steps for using baking soda and vinegar on a clogged kitchen sink:

1. Pour 1 cup of baking soda down the drain.
2. Add 1 cup of white vinegar and let it fizz for about 15 minutes.
3. Rinse with hot (not boiling) tap water to wash the loosened debris away.

With luck, this will unclog your drain, but if not, you may also need the items below:

To try to unclog the sink yourself, you will need the following:

• Wet-dry vacuum (wet vac)
• Gloves
• Auger (plumbing snake)
• Flashlight or lighting – your phone may work, but if you end up having to work from below the sink, you will need to be able to see clearly.

If you are working with a two-sided sink, always make sure to plug the drain on the side opposite the one you are working on. Otherwise, you are just pushing the water back and forth between the two sinks instead of sending pressure toward the clog.

How Do You Use a Sink Plunger on a Double Kitchen Sink?

A sink plunger creates pressure that can push a clog through the shared drain line rather than just moving water between the two bowls.

You may also be able to plunge the sink to clear the clog. To try that, remove most of the water from the sink, leaving only enough to cover the head of the plunger, block the sink you are not plunging, and make sure you get a good seal over the drain.

For best results, use a flat-bottom sink plunger instead of a toilet plunger so you can keep firm contact with the sink surface.

If that does not work, you may well decide to call a plumber, and at Four Seasons, we’re homeowners too, so we understand the issues you must deal with when you have a clogged sink and we know how to repair it properly.

If neither of the first three methods work, you will need to try using some further approaches that may help you unclog your drain. However, at this point, you may want to call an  Ashville plumber to prevent having to call an emergency plumber.

Can a Wet-dry Vacuum Help Unclog a Two-sided Kitchen Sink?

A wet-dry vacuum can sometimes pull a clog out of the drain opening instead of pushing it deeper into the pipe.

• Set the vacuum to wet suction and put the hose in the drain.
• Create a seal in the sink around the hose and drain.
• As always, plug the second side of the sink with a rubber plug.
• Turn the wet-dry vacuum on the highest setting; this should unclog the drain if the blockage is close to the sink opening.

How Do You Use an Auger (plumbing snake) on a Kitchen Sink Clog?

If the wet-dry vacuum does not work, you can try an auger, also known as a drain snake. If you have a garbage disposal, you will not be able to feed the auger from the top; you can still unclog the sink with the auger, but you will need to cap off the disposal drain to keep dirty water from backing up into the disposal or dishwasher.

• Feed the auger into the drain until you reach the clog. When you meet resistance, you’ve found your clog.
• Once you find the clog, you may be able to grab and pull the clog out. However, if that doesn’t work, you will need to push it out. To do this, pull about a foot or foot and a half of extra cable from the auger, and use it to push the clog out.
• If you don’t meet resistance, the clog may be further down the pipe.

What if the Clog is further Down the Pipe?

If the clog is further down the pipe, you will need to run the auger through the pipe into the wall, which means you will have to undo the connections underneath the sink, and while you can certainly try this, your clog could well be in the main line, and you will need a licensed plumber in Asheville to clear the drain.

What Causes a Double Kitchen Sink to Back up?

A double kitchen sink often backs up when food particles, grease, soap scum, and other debris collect in the shared P-trap or horizontal drain line, especially where the garbage disposal and dishwasher connect to the pipe. Over time, these materials narrow the opening so water backs up into both sides of the sink instead of flowing freely into the main drain.

Common culprits include:

• Grease and cooking oil
• Coffee grounds
• Starchy foods like rice and pasta
• Fibrous scraps such as celery or onion skins

How Do You Unclog a Kitchen Sink with Standing Water on Both Sides?

To unclog a kitchen sink with standing water on both sides, remove as much water as you safely can, plug one drain, and use a sink plunger on the other side to push the clog through the shared line before trying baking soda and vinegar, a wet-dry vacuum, or an auger.

Here are the basic steps:

1. Scoop or shop-vac out excess standing water from both bowls.
2. Plug one drain tightly and place a sink plunger over the other drain.
3. Plunge in firm, steady strokes for 20–30 seconds at a time.
4. Run hot tap water to see if the sink drains; if not, repeat or move on to a wet-dry vacuum or auger and call a plumber if the blockage still doesn’t clear.

One clogged drain can lead to major problems, and we can handle all your needs, from kitchen plumbing, valve replacement, water pressure, minor and major leaks, water heater repair and installation, to repairs, installation, maintenance, and upgrades to all your plumbing fixtures and service.

Call Four Seasons Plumbing Today

At Four Seasons Plumbing, we have a lifetime workmanship guarantee, and our professionals deliver high-performance services and top-notch customer service. Call our licensed Asheville plumbers today to get your two-sided kitchen sink draining smoothly again and your kitchen left as clean as we found it.