How to Snake a Drain and Know When to Stop Turning

One slow drain or several backed up?

If water is lingering in one fixture, we'd check the other drains before reaching for the handle, because several backed-up drains can point to a main-line problem. A hand snake makes sense for a small, localized obstruction that you can reach through an accessible drain.

Hair, soap scum and other debris are suitable targets for a snake. Its flexible cable works around curves, and the tip can break material apart or catch it for removal, so clearing the obstruction can involve both advancing and retrieving the cable.

Check whether this is a job for your hand snake

Keep this a small plumbing job you feel confident doing. Before opening the drain, check that all three conditions below fit your situation.

Only proceed if you're confident handling the job at the relevant fixture:

• Kitchen sink
• Bathroom sink
• Bathtub
• Shower

Call a plumber if you're unsure about the procedure, several drains are backing up, you suspect a sewer blockage, or you notice pipe damage or foul odors. Basic homeowner augers may not reach a sewer clog through a fixture opening, so leave that work to a professional.

Choose a flexible manual cable

Look for a flexible, hand-crank cable snake, also sold as a drain auger or plumbing auger. A cable auger has a corkscrew end and a manual crank, and flexible drain snakes suit sink, tub and shower drains.

For minor sink clogs, Apollo Home describes light-gauge hand augers as typically 1/4 inch in diameter and no longer than 10 or 15 feet. That recommendation addresses hairballs or food remnants in the U-shaped trap below the sink or a few feet farther along the drainpipe.

Choose a narrow-diameter snake for tight bends. Work slowly with the correct tool, especially around old or fragile pipes, because the wrong snake or excessive force can damage them.

Don't rely on chemical drain cleaners to clear the blockage. They can damage pipes and septic systems and may fail on stubborn clogs. If your home uses a septic system, avoid chemical drain openers because harmful chemicals can affect the bacteria that break down waste and can reach groundwater.

Make room for the mess

Clear the space beneath the sink or around the clogged fixture before handling the cable. Lay towels around the work area and have a bucket ready to catch spillover and retrieved debris.

Put on rubber gloves and safety goggles before feeding the snake. Roto-Rooter calls goggles optional but helpful, while Bob Vila instructs readers to wear them, especially if chemical cleaner has already been poured into the drain. We'd follow the more protective instruction for this messy job.

Use the right opening for your fixture

At a sink, remove the stopper or drain cover to expose the opening. Which parts you remove for access depends on the fixture: a stopper, P-trap or overflow assembly may be in the way. If the stopper is holding you up, follow our guide to removing a bathroom sink stopper.

Put a bucket beneath the P-trap to catch possible leaks. You can feed the cable through the sink drain, or remove the P-trap for better access to the wall drain if resistance at the curve is too high.

For a bathtub, remove the overflow plate to reach the drainpipe. From that opening, direct the cable downward into the tub's main drain, not into the overflow.

At a shower, lift off the strainer cover and remove visible debris before inserting the cable. Guide the tip in carefully so you don't scratch the shower base.

Feed slowly and control the crank

Let the cable enter slowly and naturally. Getting it started may take a few tries, and working toward a clog several feet away takes patient, inch-by-inch feeding.

For a snake with a screw-lock housing, use Apollo Home's release, lock and hand-feed sequence below. The screw holds the cable during cranking, then releases it for further feeding after you've passed the resistance.

1. Loosen the housing screw to release the cable, then insert the tip slowly into the drain until the cable is inside the opening.
2. Turn the crank gently to advance the cable. At resistance, tighten the screw just enough to keep the cable from turning in its housing, then crank clockwise with controlled, moderate pressure to work the cable forward.
3. Once you're past that resistance, loosen the screw and continue feeding by hand, not with the crank. As the cable advances, you'll feel any further resistance.

Avoid pushing the cable excessively far or driving it at the wrong angle. Either can compact the blockage or shift it deeper into the plumbing, making removal harder.

Binding or looping means stop turning

Resistance can mean a bend or a clog. Majewski Plumbing describes it as reaching the clog, but Apollo Home explicitly allows for a pipe bend, usually encountered first. At a sink, grease or soap buildup can also resist the cable.

Bob Vila advises slightly harder cranking or wiggling the wire around curves, and a few additional turns to grip a solid mass before withdrawal. Roto-Rooter and Majewski Plumbing prohibit forcing the cable, so keep that harder-cranking advice within gentle, controlled movement.

Pay attention to the cable's response as you work around a bend or into the obstruction. The tip may catch material for removal or break it apart as it advances, so the job can involve bringing debris back out as well as opening a path through it.

Bring the cable and debris back out

When the cable won't feed farther, begin withdrawing it. With the screw-lock method above, pull the cable back into its housing by hand.

Bring it out slowly, wiping the coil as it emerges and catching debris in the bucket. Remove material caught on the tip and dispose of the collected gunk safely.

Further passes can remove remaining material, particularly with a larger blockage. If the drain stays clogged after snaking and repetition, or the clog returns after clearing, stop the DIY attempt and call a plumber to inspect it.

A snake can dislodge an obstruction while sludge remains on the pipe walls. Restored flow confirms improvement at the fixture, but doesn't establish that deeper buildup has been removed.

Put it back together and check the flow

Reassemble the stopper, P-trap or overflow assembly you removed before running water. Put the drain back together before judging how well the fixture empties.

Run hot water to flush residue and watch how the fixture drains. If water still moves slowly, another pass can clear remaining material, followed by reassembly and another flow test. Look for water flowing away freely rather than continuing to collect in the fixture.