Standing water in the tub after a shower is one of the most common drain calls I get, and it is almost always one of two things: a wad of hair caught right under the stopper, or a stopper mechanism that is no longer opening fully. Both are DIY fixes, and most of the time you will not need chemicals or a plumber. A tub drain is its own animal, different from a slow sink or a main-line clog, because of the stopper linkage built into it.
First: Is It the Hair or the Stopper?
Two questions sort it fast. Did it go slow gradually over weeks? That is hair buildup in the drain just below the stopper, the number-one cause. Did it suddenly stop draining or start trapping water with no warning? Look at the stopper, a lift-and-turn, push-pull, or trip-lever stopper that sticks closed will hold water even with a clear pipe. Knowing which saves you from snaking a drain that was not even clogged.
Know Your Stopper Type
Tubs use a few stopper styles, and how you remove them differs:
| Stopper type | How it works | To remove |
|---|---|---|
| Lift-and-turn / push-pull | Sits in the drain, twist or push to seal | Unscrew the knob, lift it out |
| Toe-touch / foot-actuated | Spring-loaded, push to toggle | Unscrew the cap counter-clockwise |
| Trip-lever (overflow plate) | Lever on the overflow plate raises an internal plunger or rocker | Unscrew the overflow plate, pull the linkage out the top |
How to Clear the Tub Drain, Step by Step
- Remove the stopper. Take it out per the table above so you have an open drain to work in.
- Pull the hair. Slide a plastic drain-cleaning strip (the barbed zip tool) down the drain and pull, you will be amazed and disgusted by what comes up. This alone fixes most slow tubs.
- Plunge it. If it is still slow, cover the overflow opening with a wet rag (so the plunger gets suction) and plunge the drain firmly a dozen times.
- Snake it if needed. Still blocked? Run a homeowner drain snake a few feet down to break up a clog past the stopper.
- Check the trip-lever linkage. On a trip-lever tub, pull the linkage out through the overflow plate, hair and soap collect on the plunger, and a misadjusted linkage can hold the drain partly closed. Clean it and reset the rod length.
- Reassemble and test. Put the stopper or linkage back, run water, and confirm it drains freely.
Stop It Coming Back
Skip the caustic drain cleaner, it can damage finishes and an old tub waste, and it does not remove hair, it just sits on it. The real prevention is a hair catcher over the drain and pulling it clean every couple weeks. If your stopper is corroded or never sealed right, a new bathtub stopper is a cheap upgrade.
When to Call a Pro
Hair and stopper fixes are DIY. Call a plumber if multiple fixtures back up along with the tub (that is a main-line problem, not the tub), if you get a sewer smell or gurgling from other drains, or if you have snaked it and it still will not clear, which can mean a blockage deeper in the branch or waste line.
Frequently Asked Questions
Why is my bathtub not draining?
The two usual causes are a hair clog in the drain just below the stopper, which builds up gradually and slows the tub over weeks, and a stopper that is stuck closed, which traps water even when the pipe is clear. Remove the stopper and check both: pull out any hair with a barbed drain tool, and make sure the stopper or trip-lever linkage is actually opening all the way.
How do I unclog a bathtub full of standing water?
Remove the stopper, then use a barbed plastic drain strip to pull the hair clog out from just inside the drain, which clears most tubs. If it is still slow, cover the overflow with a wet rag and plunge firmly, then run a short drain snake if needed. Avoid caustic drain cleaner, it does not remove hair and can damage an old tub waste. A hair catcher over the drain afterward prevents the repeat.
What is the trip lever and how does it cause drainage problems?
The trip lever is the small lever on the overflow plate at the head of the tub. It connects to an internal linkage, either a plunger or a spring-loaded rocker, that opens and closes the drain. Hair and soap scum collect on that linkage, and if the rod is misadjusted it can hold the drain partly closed, so the tub drains slowly or traps water even though the visible drain looks clear. Unscrew the overflow plate, pull the linkage out the top, clean it, and reset the rod length.
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