Key facts: Shower and Tub Drains
- Hair bound with soap scum forms a rope below the strainer that causes most tub and shower clogs.
- Riverside's tap water averages about 12 grains per gallon of hardness, stiffening soap scum inside bath drains [1].
- Tub drains are usually cleared through the overflow opening, which avoids catching the cable on strainer crossbars.
- In slab homes, tub and shower traps sit in a box-out in the slab and can't be reached from below [2].
What actually blocks a bath drain
Tub and shower drains are larger than lavatory drains, usually an inch and a half for a tub and two inches for a shower, but they collect far more hair. Long hair is the main ingredient. It wraps around the crossbars of the strainer and the tub stopper mechanism, then forms a rope that hangs into the trap and catches soap residue, conditioner and body oils.
Hard water stiffens that rope. With Riverside tap water at roughly 12 grains per gallon [1], soap and minerals combine into scum that coats the hair and binds it to the pipe wall. Unlike a sink, a tub trap sits under the floor or inside a wall and is rarely reachable from below without opening a panel. That shapes how the clog is cleared.
Older bathtubs add another possibility: a drum trap. These cylindrical traps, common in houses built before the mid-twentieth century, sit in the floor near the tub with a screw-on cover. They collect sediment and hair, and a cable sometimes can't make the turns through them. Knowing whether a house has one changes the approach. Tubs and showers are one entry in the Riverside drain services directory.
Signs
Why is my shower drain so slow?
Water around your ankles
If the shower floor floods during a normal shower, the drain is only passing a fraction of its rated flow.
Tub drains, then stops
A clog that lets a little through and then seals is often a hair rope that swings shut as water level drops.
Ring of grime after every bath
Water that sits long enough to leave a line of residue is draining far too slowly.
Bubbles from the tub when the toilet flushes
Air pushed up through the tub drain means the shared bathroom branch is restricted.
Read moreWater appearing in the tub from elsewhere
Wastewater rising into a tub from another fixture means a downstream stoppage, often in the main line.
Read more
Overflow access on a standard bathtub
Procedure
How tub and shower drains are cleared
- 1
Protect the finish
Drop cloths go down and the tub or shower pan is covered where tools will rest. Enamel and acrylic chip and scratch easily.
- 2
Remove strainer and stopper
Shower strainers unscrew or pry out; tub stoppers come out by type, from toe-tap to lift-and-turn to trip-lever.
- 3
Go through the overflow on tubs
Removing the overflow plate gives a straighter run past the trap than going through the strainer, and avoids catching the cable on the crossbars.
- 4
Pull out the hair
A small drum auger with a grabber head is run in and withdrawn slowly to bring the hair rope out instead of pushing it further.
- 5
Check for a drum trap
If the cable won't pass or the tub predates modern P-traps, the contractor looks for a drum trap cover nearby and cleans it directly.
- 6
Flush and reseal
Water is run at volume, the stopper and overflow gaskets are checked, and everything is reinstalled watertight.
Stoppers
Tub stoppers and how they come out
| Stopper type | How it is removed | Notes |
|---|---|---|
| Toe-tap | Unscrew the cap, then the body | Hair collects under the cap |
| Lift-and-turn | Turn to open, find the set screw or unthread | Some use a hidden screw under the knob |
| Push-pull | Unscrew the knob, then the body | Similar to toe-tap |
| Trip-lever (plunger) | Remove the overflow plate and pull up the linkage | The plunger inside the overflow tube can be packed with hair |
| Pop-up rocker | Pull the rocker arm out of the drain | The spring end catches hair |
| Shower strainer | Unscrew or pry up | Some are tiled in and need a special tool |
Upkeep
Keeping a bath drain flowing
- Use a hair catcher that sits inside or over the strainer, and empty it after every few showers.
- Brush long hair before showering so less of it reaches the drain.
- Rinse the tub with hot water after bath oils or bath bombs, which leave a greasy film.
- Wipe the strainer crossbars weekly; a few strands left there build a mat quickly.
- Don't wash paint brushes, plaster or grout tools in the tub. Solids settle in the trap.
- Avoid chemical openers in tubs; they can etch enamel and attack older brass waste fittings.
Why Riverside showers clog the way they do
Hard water is the common thread. The scale it leaves on glass doors forms inside the drain as well, and in a shower that sees several uses a day the hair-and-scum mat builds quickly. A contractor clearing a Riverside shower will often find white mineral grit packed with the hair.
Age matters too. Riverside's pre-war housing in districts like the Wood Streets [3] includes original clawfoot and built-in tubs, some of which still drain through drum traps or lead bends. Those fittings are fragile and the right tool may be a hand auger rather than a powered machine. In slab-built homes, tub and shower traps are set into a box-out in the slab [2]; they can't be reached from below, so work happens through the strainer, the overflow or an access panel if one was provided.
Where a tub sits on the lowest floor of a home, it is often the first fixture to show a main-line backup. If water appears in the tub when the washer drains or the toilet flushes, the problem is not the tub's own drain.
Why does my tub still drain slowly after cleaning?
Sometimes the hair comes out, the cable runs clear and the shower still drains slower than it should. The usual suspects are a venting problem, a collapsed or scaled section of the branch, or a trap that was installed with too little slope on its arm. A drain camera inspection shows which.
Remodels can introduce their own issues. A walk-in shower converted from a tub may have kept the old inch-and-a-half drain, which is undersized for a modern shower valve. Linear drains in curbless showers have long, shallow channels that collect hair along their length. The contractor will explain whether a cleaning is enough or whether a fitting needs changing.
Clawfoot tubs and freestanding baths
Freestanding tubs, both original clawfoots and modern reproductions, drain through an exposed waste and overflow assembly that drops through the floor into a trap below. The exposed pipe is easy to reach, but the trap is often under the floor where only a crawlspace or ceiling opening gives access. On slab homes with a freestanding tub, the trap is set in the slab box-out directly under the drain.
Hair collects in the same places as on a built-in tub: the stopper, the overflow tube and the trap. The difference is that the exposed brass or chrome waste pipe can be loosened at its slip joints for cleaning, which a contractor will do carefully because older finishes and threads are easy to damage. Replacement parts for antique wastes aren't always available, so gentle handling is worth asking about.
Shower pans, curbless floors and linear drains
Modern Riverside remodels often swap a tub for a walk-in shower, and the drain beneath changes with it. A traditional shower pan slopes to a round centre drain with a removable strainer. A curbless shower with a linear drain uses a long, narrow channel along one wall with a slotted grate. Linear drains look clean but have a large surface for hair and soap to settle on, and their outlet is often smaller than the channel suggests.
Cleaning a linear drain starts with lifting the grate and the hair-catching insert most manufacturers include, then flushing the channel. If water still stands, the contractor cables the outlet, which may sit at one end of the channel. Because these systems are tiled in, care is taken not to disturb the waterproofing membrane around the drain body.
Tiled shower pans have one more weak point: the weep holes in a clamping-ring drain, which let water that soaks through the grout escape into the drain. When weep holes clog with mortar or soap, water saturates the bed under the tile, which can smell and stain. A contractor clearing the drain may point this out if the shower floor stays damp long after use.
Preparation
Before you call about a tub or shower
- Note how long the water takes to clear after a five-minute shower.
- Check whether other fixtures in the bathroom also drain slowly or gurgle.
- Identify the stopper type if you can, or take a photo of it.
- Tell the contractor if the tub is original to an older house or if the shower was remodelled.
- Mention whether you have a water softener, which changes how much scale to expect.
FAQ
Shower and bathtub drain questions
Why does my shower drain clog every few weeks?
A shower drain that clogs every few weeks usually has hair snagging on a rough spot, a stopper linkage or scale inside the trap. Each new strand builds on the last. Riverside's hard water adds scale and soap scum, so a hair catcher and a thorough cleaning of the trap usually break the cycle.
Is it safe to pour boiling water down a bathtub drain?
Pouring boiling water down a tub drain is not recommended. Boiling water can soften PVC joints and crack porcelain, and it rarely clears hair clogs. Hot tap water is safer for routine flushing. For a real stoppage, remove the stopper and pull the hair out, or call for a cable.
What is a drum trap, and why does it matter for my old bathtub?
A drum trap is an older canister-style trap found under some vintage tubs, often in homes built before modern codes. Drum traps collect hair and debris and are hard to clean through the tub drain. Many contractors recommend replacing them with a standard P-trap during repairs.
Why does my bathtub fill with water when the washing machine drains?
A bathtub filling during the washer's drain cycle means the shared line downstream is restricted, often the main. The washer pumps water quickly, and with nowhere to go it rises at the lowest nearby opening. Stop using water and call to have the line cleared before sewage follows.
Can a contractor clear my shower drain without removing tile?
A contractor can almost always clear a shower drain through the strainer or the tub's overflow opening without removing tile. Cables and small jetting hoses reach the trap and branch. Tile removal is only needed if the drain itself is broken or the pipe needs repair.
How do I get the stopper out of my bathtub drain to clean it?
Tub stoppers come out in different ways: lift-and-turn stoppers unscrew, toe-touch types twist off, and trip-lever stoppers come out through the overflow plate. Pull hair from the stopper and linkage, then flush with hot tap water. If you cannot identify the type, the contractor can show you.
Should a linear shower drain be cleaned differently from a round one?
Linear shower drains have a long channel that collects hair and soap along its length, so the cover lifts off and the channel needs wiping clean. Round drains collect debris at the strainer. Both lead to a trap that may need cabling if water still drains slowly.
