Hair clog

Short definition

A hair clog is a tangled mat of hair, soap scum, and body oil at the first restriction in a bathroom drain — the pop-up assembly in a sink, the trip-lever linkage in a tub, or the strainer in a shower. It’s the single most common cause of slow bathroom drains. A $3 plastic Zip-It strip pulls most of them in under two minutes.

What it is

Hair sheds in the shower, sink, and tub. It binds with soap scum and body oil into a mat that catches at the first narrow point in the drain — usually visible just below the stopper. Once the mat builds up, water has to wind around it, and the drain slows long before it fully blocks.

The fix depends on the fixture:

Lavatory sink (bathroom sink):

1. Remove the pop-up stopper (often a counter-clockwise twist or unhook the rod from below).
2. Pull the hair mat by hand (gloves) or with a Zip-It plastic strip — the barbed strip slides past the mat and catches it on the way out.
3. If still slow, pull the P-trap and clean it.

Tub:

1. Unscrew the trip-lever cover plate, pull the linkage and stopper.
2. Hair often wraps the linkage — clean and reseat.
3. If the linkage is clear and the drain is still slow, snake through the overflow (“cabling through the overflow,” ug) — rod-down through the trip-lever is rarely productive.

Shower:

1. Unscrew the strainer cover.
2. Remove visible hair with a Zip-It or needle-nose pliers.
3. If still slow, hand-snake through the strainer.

Prevention: a hair-catching strainer over the drain plus a monthly Zip-It pull keeps most bathrooms running.

Why it matters to a homeowner

Hair clogs are the highest-frequency, lowest-skill drain repair in the home. Pulling a hair mat with a Zip-It is faster than calling a plumber and cheaper than a bottle of drain cleaner — and it works the first time. Long-haired households should expect monthly cleanups at the most-used drain.

When a plumber bills “drain cleared” on a bathroom sink, this is almost always the job. The labor is the bulk of the cost.

Common failure modes

• Recurring monthly clog. Long-haired household plus no strainer.
• Hair mat in old slip-joint trap. Traps deteriorate when over-tightened during cleaning — replace if the trap is cracked.
• Trip-lever linkage caked with hair. Tub-specific; remove and clean.
• Strainer-stage hair (visible) vs. trap-stage hair (deeper). Different access requirements.

Common variants

• Hair clog (bathroom) vs. grease clog (kitchen). Different fixtures, different remedy.
• Pop-up hair clog (sink) vs. tub-trap hair clog. Different access.
• Hair plus soap scum vs. hair plus mineral scale. Hard-water households see both — descale fixtures regularly too.