Why Chemical Drain Cleaners Cause Trouble

In a nutshell

Chemical openers work, a little, on soft organic build-up right at the trap. Most real clogs are further along, packed with grease, hair or paper. The chemical sits, heats the pipe, and stays there for whoever opens the line next. Older metal pipe and chrome can be damaged. Mechanical clearing works better and is safer.

Lye-based products generate heat as they react, and that heat is hard on old PVC glue joints and thin chrome traps. Acid-based openers are worse: they can etch porcelain and attack metal fittings, and they burn skin and eyes. In a house with a septic system, harsh chemicals also kill the bacteria the tank depends on. A plumber who arrives to find a sink full of caustic water has to bail it out carefully before any work can start, which adds time to the bill.

Working through it

1. Plunge properly

Cover the overflow, use a cup plunger on sinks, and work it firmly.

2. Pull the stopper

Hair on the pop-up often solves bathroom sinks outright.

3. Use a hand auger

A small drum snake reaches past the trap.

4. Take off the trap

With a bucket underneath, clean it out by hand.

5. Know when to quit

Still slow after all that? The blockage sits deeper than household tools reach.

Clues worth noticing

• Several fixtures slow at once.
• The same drain clogging again and again.
• Gurgling from a nearby sink.
• A smell that comes back after cleaning.

Signals that it needs a licensed plumber

For drains that will not clear, see drain cleaning.