How to Use a Drain Snake (Auger)
When plunging fails and baking soda won't cut it, a drain snake is your next move. A drain snake — also called a plumber's auger — is a flexible metal cable that you feed into a pipe to physically break through or pull out a clog. It reaches places that plungers can't: deep in the P-trap, down the branch drain inside the wall, and beyond. For about $25, a basic hand snake handles 90% of household drain clogs. Here's how to use one without damaging your pipes or making the problem worse.
Time Required
15-45 minutes
Difficulty
Moderate
When to Call a Pro
Multiple drains affected
Choosing the Right Snake
- Hand drain snake (15-25 feet, $15-30): A flexible cable in a drum canister with a hand crank. This is the standard tool for sink, tub, and shower drain clogs. The 1/4-inch cable navigates tight bends in small drain pipes. Feed the cable into the drain opening or through the P-trap cleanout and crank the handle to push it through the pipe.
- Toilet auger / closet auger ($15-25): Specifically designed for toilets. It has a rigid metal tube with a protective rubber or vinyl sleeve that prevents the cable from scratching the porcelain. The cable extends from the curved end of the tube and reaches 3-6 feet into the toilet's internal trap. Never use a regular drain snake in a toilet — the bare metal cable will leave permanent scratches in the bowl.
- Power drain snake (50-100 feet, $200+ or rent for $40-60/day): A motorized snake with a thicker cable for main sewer line clogs. Available for rent at most home improvement stores. The motor provides the torque needed to cut through tree roots and heavy buildup in 3-4 inch main lines. Exercise extreme caution — the spinning cable can cause serious injury if it catches on clothing or skin.
- Drum auger vs. pistol-grip: Drum augers hold the coiled cable in a canister and work well for longer runs. Pistol-grip snakes have a compact design with a trigger mechanism and are easier to use in tight spaces under sinks. Either works for household drains.
Using a Hand Snake on Sinks and Tubs
Remove the drain cover or P-trap
For the best results, remove the P-trap under the sink and feed the snake directly into the wall pipe. This bypasses the tight bends in the trap and gives the cable a straight shot at the clog. If you'd rather not remove the trap, feed the snake through the drain opening — it will navigate the P-trap but may take more effort.
Feed the cable while cranking clockwise
Loosen the thumbscrew on the canister, pull out 6-12 inches of cable, tighten the screw, and crank the handle clockwise while pushing the canister toward the pipe. The rotation helps the cable navigate bends. When you've fed all the exposed cable in, loosen the screw, pull out another 6-12 inches, and repeat. Always crank clockwise — counterclockwise can unwind the cable.
Work through the resistance
When you feel the cable hit something, you've found the clog. Push forward and pull back while cranking to either bore through the obstruction or hook it onto the snake tip. You'll feel the cable suddenly move freely when the clog breaks. If the snake tip hooks the clog, you'll feel steady resistance as you retract — pull it out slowly.
Retract, clean, and test
Slowly pull the snake back out, continuing to crank clockwise. Have a bucket and rags ready — the cable will be coated in drain sludge and the clog material may come out with it. Reassemble the P-trap and run hot water for 2-3 minutes to flush the pipe clean. Test by filling the sink and releasing — it should drain quickly.
Using a Toilet Auger
Retract the cable fully into the tube
Before inserting the auger into the toilet, pull the handle up so the cable is fully retracted inside the protective tube. The curved rubber end of the tube is what goes into the toilet bowl first.
Position the curved end into the drain
Place the rubber-coated curved end of the tube into the toilet drain opening at the bottom of the bowl. Angle it so the curve follows the natural path of the toilet's built-in trap. The rubber sleeve protects the porcelain from scratches.
Crank and push the cable through
Push the handle down while cranking clockwise to extend the cable through the toilet's internal trap and into the drain pipe below. When you feel resistance, work the cable back and forth while cranking. Most toilet clogs are within the first 1-2 feet of the trap, so you won't need to extend the cable far.
Retract and flush
Crank the handle while pulling up to retract the cable back into the tube. Remove the auger from the bowl carefully. Flush the toilet to test — if it drains normally, you're done. If the clog persists, repeat the process. Clean the auger thoroughly after use.
When to Call a Professional
- Multiple fixtures are affected: If the kitchen sink, bathroom sink, and tub are all draining slowly or backing up, the clog is in the main sewer line — not a branch drain. This requires a professional snake (50-100+ feet) and often a camera inspection.
- The clog keeps coming back: If you clear a clog and it returns within days or weeks, there's likely a structural issue: tree root intrusion, a bellied (sagging) pipe, or a partial pipe collapse. A camera inspection will identify the root cause.
- You smell sewage in the house: Sewer gas odors combined with slow drains indicate a serious blockage or a broken vent pipe. This needs professional diagnosis.
- Water backs up into other fixtures: If flushing a toilet causes water to come up in the shower, or running the washing machine backs up the kitchen sink, the main line is blocked. Stop using water and call a plumber.
- The snake hits an immovable obstruction: If your snake cable hits something hard that you can't break through or push past, it could be tree roots, a collapsed pipe section, or a foreign object lodged in the line. Forcing the snake can damage the pipe.
Pro Tips
- •Protect your surfaces: Lay old towels around the work area. The snake cable will be coated in black drain sludge that stains countertops, floors, and clothing. Wear rubber gloves and old clothes.
- •Don't force it through bends: If the cable resists at a pipe bend (not a clog), try gently pulling back an inch and cranking while pushing forward again. The rotation helps the tip navigate turns. Forcing the cable can kink it or scratch the inside of the pipe.
- •Remove the P-trap for better access: Snaking through the drain opening means navigating the cable through the tight P-trap bend. Removing the trap and feeding the snake directly into the wall pipe is faster and more effective, especially for clogs past the trap.
- •Run water while snaking: Once you've broken through the clog, keep the snake in place and have someone run hot water. The water flushes loosened debris while the snake keeps the opening clear. This prevents the clog from reforming immediately.
- •Rent, don't buy, a power snake: Power drain snakes are expensive and rarely needed for household drains. Home Depot and most hardware stores rent them for $40-60/day. Get the store staff to show you how to operate it safely — the spinning cable can be dangerous.
Frequently Asked Questions
What is the difference between a drain snake and a toilet auger?
A drain snake (also called a hand auger) is a flexible metal cable in a canister with a hand crank. It's designed for sinks, tubs, and shower drains. A toilet auger (closet auger) has a rigid metal tube with a rubber or plastic sleeve that protects the toilet's porcelain from scratches, and the cable extends from the end of the tube. Never use a regular drain snake in a toilet — the exposed metal cable will scratch and permanently damage the porcelain bowl.
How far should a drain snake go?
For sinks and tubs, most clogs are within the first 5-10 feet of pipe — in the P-trap or the horizontal branch drain leading to the wall. A 15-25 foot hand snake covers this range. For main sewer line clogs, professional snakes extend 50-100+ feet. If your hand snake reaches its full length without hitting the clog, the blockage is in the main line and requires professional equipment.
When should I call a plumber instead of snaking the drain myself?
Call a plumber if: the clog affects multiple fixtures simultaneously (indicating a main line blockage), the snake hits something hard it can't penetrate (possibly tree roots or a collapsed pipe), the clog returns within a few days of clearing it (suggesting a deeper structural issue), you smell sewage from the drains, or water backs up into the lowest fixtures in your house like basement floor drains.