How to unclog a tub drain

Start by removing the stopper and pulling out the hair clump behind it, because that is the cause of most slow tub drains. If water still sits, seal the overflow opening and plunge, then try a hair tool or a small drain snake. Skip bottled drain openers. The order matters: each step is gentler and cheaper than the next. If none of it works, the clog sits deeper than the tub, and it becomes a job for drain cleaning help from a local plumber. Below are the steps, the safety limits and what Pasadena houses tend to hide.

Where do I start when the tub will not drain?

Pull the stopper and clear the hair. Many stoppers unscrew counterclockwise; a pop-up or trip-lever type lifts out with the linkage. Fish out the clump with needle-nose pliers or a plastic barbed strip, rinse the stopper, put it back and run hot water. That clears most tub clogs in ten minutes.

How the stopper comes out depends on the brand. Delta, for example, describes two common types, lift-and-turn and toe-tap, that both unscrew when held in the full-up position, while a stripped thread may mean working from beneath the tub. Kohler's guide for trip-lever drains notes that hair also wraps the control wire, so pull the linkage and wipe it. Use a soft tool, not a screwdriver, which can scratch the drain. Wear gloves and have a bag ready, since the hair is slimy.

Can a plunger clear a tub drain?

Yes, if you seal the overflow. The overflow plate, the slotted cover on the tub wall, lets air escape and ruins the suction. Block it with a damp rag or a strip of tape, leave a few inches of water in the tub, seat a cup plunger squarely over the drain and work it up and down for about twenty strokes.

Use a flat cup plunger, not the flanged one made for toilets. Keep the water level above the rubber lip so it holds a seal. If the clog loosens, you will see the water drop; run hot water to flush it. If nothing changes after a few rounds, the blockage is farther down or the trap is packed. Plunging that goes on too long can force water back up a connected line, so stop if the sink beside the tub bubbles. If more than one fixture is slow, the shared-line signs are described in unclogging a shower drain.

What if the plunger does not help?

Reach for a plastic barbed strip or a small hand auger. Slide it into the open drain, turn it slowly until it meets resistance, jiggle it to snag or break up the mass, then draw it out and rinse the mess down with hot water.

The curved trap below the floor, or the overflow tube that joins the drain, is where tub hair usually ends up. Feed the tool steadily instead of forcing it, since a sharp bend can scratch a plastic trap. Run a little water as you go and watch how fast it leaves. When a snake comes back with only a little hair but the tub is still slow, the blockage is probably beyond the reach of a short hand tool.

Are chemical drain cleaners safe for a bathtub?

Not a good first choice. The main ingredients in many drain openers are lye or sulfuric acid, which can burn skin, damage eyes and release harmful fumes, and they can sit in the tub if the clog does not clear, leaving you to stand in them. They can also harm older pipes and mix dangerously with other products.

Poison Control says never to combine ammonia and bleach products, and the CDC has written up chlorine gas exposure from mixing bleach with other cleaners, including a case in California. If any of it splashes on skin or eyes, rinse well and phone Poison Control on 1-800-222-1222. A safer route is hot water, a plunger and a snake; if you want to try an enzyme cleaner for hair and soap, follow the label and do not combine it with anything else. Never use a chemical product before you call a plumber, since the plumber has to work in the water.

Why does my tub drain keep clogging, even after I clear it?

Hair and soap scum are the cause in most homes, but repeat clogs point to a trap or line that is rough, scaled or partly blocked. Pasadena Water and Power reported hardness of 202 to 256 ppm for 2025, and hard water leaves scale that catches soap and hair.

Older houses around Pasadena may have cast iron, galvanized or clay lines that grow rough inside, and some have older trap styles that collect debris. The cheapest prevention is a hair catcher sitting in the drain. When the tub and a neighboring sink or toilet slow down together, suspect the branch line or the vent, and look at a clogged drain vent and sewer smell in the house. A gurgle after a flush or a smell is a flag. For a tub and shower in one stall, see also a clogged shower drain.

When should I stop and call a plumber?

Pick up the phone when two or more fixtures are slow, the tub fills when a toilet flushes, a snake will not pass, or the clog is back within days. Sewage odor is another trigger. Each of those signals trouble in the main line, which a plumber clears with a bigger machine or a camera.

Stop earlier if you cannot get the stopper out without breaking it, or if the drain parts are corroded. We send a local plumber out to the house, and the quote page is where a request begins. Tell the plumber what you tried so work does not repeat it, and mention if you used a chemical product, since that affects safety.