How to Use a Drain Snake Without Damaging Your Pipes

Updated July 2026 · 7 min read · Geelong Emergency Plumbing

A drain snake — also called a plumber's auger — is the gap between a plunger and a plumber's call-out fee, and it's a gap worth knowing how to cross. Used correctly it clears blockages two to three metres into the pipe that no kitchen product reaches; used incorrectly it scratches porcelain, punctures pipes or breaks P-trap seals and creates a more expensive problem than the one it was solving. Here's the full technique, for each drain type, without the damage.

The Two Snakes You'll Encounter

Hand drain snake (manual auger) — a flexible steel cable coiled inside a drum with a hand-crank, typically 7–15 metres long and 6mm in diameter. The entry-level tool. Costs $15–$50 at any hardware store, handles most household sinks, showers and baths.

Toilet auger — shorter (roughly 90cm), with a protective rubber sleeve around the bend that stops the metal cable scratching the porcelain. Critical distinction: a standard snake sent down a toilet without this sleeve will mark the bowl. If you're working a toilet, use a toilet auger specifically, or wrap the snake tip in cloth secured with tape. They're purpose-made for each other and the sleeve is doing important work.

Before You Start: Three Checks

1. Know what's downstream. Older PVC pipes, ceramic tiles around floor wastes, and the lead or clay pipes in pre-1970s homes are all softer than the steel cable. Firm is right; aggressive is expensive.
2. Wear gloves and set down drop sheets. What comes back up is whatever caused the blockage, and it's not shy about sharing.
3. Remove the drain cover. Feed the snake into the drain opening directly, not through the grate — the grate's slots are too narrow for the cable on most snakes, and fighting the grate damages both.

The Step-by-Step Technique

Step 1: Feed slowly. Extend two to three feet of cable, set the lock, and feed it into the drain with gentle forward pressure while turning the crank clockwise. Steady rotation keeps the cable moving smoothly around bends; static pushing kinks it. If it resists a bend, ease back slightly and add rotation — the cable needs to spiral through the curve, not jackknife into it.

Step 2: Feel for the blockage. Resistance suddenly increases — that's the blockage. Don't muscle through immediately. Maintain clockwise rotation and apply gentle forward pressure; the corkscrew tip is screwing into the material, which takes a moment. You're looking for the cable to grab, not to punch.

Step 3: Clear or retrieve. Once the tip grabs, you have two options: push through and break the blockage apart (works for soft clogs), or reverse slowly and pull the material back out (better for hair masses and cloth — don't push a sock deeper). For toilet augers: rotate clockwise on the way in and on the way out; the tip is designed to unscrew as it retrieves.

Step 4: Flush and test. Run the hot tap (or flush the toilet) while the snake is still in place if possible — water helps clear debris you loosened. Then remove, flush again, and confirm flow is restored.

The Mistakes That Cause Damage

• Forcing a kink. A bent or kinked cable under force can puncture or crack older pipes. If the cable bunches, back off and re-feed with lighter pressure and more rotation.
• Going anti-clockwise. Turning the crank backwards unscrews the cable sections — you'll end up with a disconnected cable inside your pipe, which is a story plumbers are paid well to resolve.
• Scratching porcelain. Unprotected steel cable against a white toilet bowl is a permanent relationship. Toilet auger with rubber sleeve, or wrap the tip.
• Pushing unknown objects deeper. If you suspect a solid object (toy, cap, cloth), retrieve direction only — pushing creates a more expensive extraction.
• Stopping too soon. Push past where you feel resistance clear, not just to it — what feels like "clear" at the clog is often a compressed path through the middle of a hair mass that closes again in a week.

When the Snake Hits Something It Can't Move

If the cable hits solid resistance that won't yield to rotation after a genuine effort, stop. You've likely found roots, a collapsed pipe, or a foreign object lodged firmly. Continuing risks kinking the cable into the blockage permanently. This is the CCTV moment — a camera down the drain shows exactly what stopped you, at exactly what depth, which tells you whether it's a jetter job, a root-cutting job, or a pipe repair conversation.

Electric Eels: The Professional Version

The electric eel (power drain auger) is the trade version: motorised, longer reach (up to 50+ metres for main sewer lines), heavier cable and purpose-built cutting heads. The technique is the same but the torque is not — an electric eel on an unfamiliar line without the right safety habits is how plumbers earn new respect for the equipment. Hiring one for a DIY clear is possible but not the tool to learn on; for a stubborn main-line blockage, a professional eel clear is cheaper than fixing a DIY eel incident.

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Related guides: Hydro jetting cost and how it works · How to unblock a drain · Blocked drains Geelong