Slow draining shower or bath: causes, safe fixes and when to call

What it usually means — most likely first

1. Hair and soap scum at the grate or plug. By a long way the most common cause in showers and baths. Hair binds with soap scum into a rope that sits just below the grate or wraps around the bath plug mechanism, and every shower adds a little more.
2. Build-up further along the waste pipe. Shower and bath wastes are narrow pipes. Soap scum and scale coat the walls over the years until the water can only trickle through, even with a clean grate.
3. A blockage shared with the floor waste. In many bathrooms the shower and floor waste join before they reach the main drain. If the floor waste is also slow or gurgles when the shower runs, the blockage is past that junction.
4. A blockage in the main drain. If the toilet bubbles, or water rises in the floor waste or the outside gully while you shower, the problem is downstream of the bathroom altogether.
5. A problem with the pipe itself. On older homes we find corroded metal wastes, pipes laid with too little fall, and sagging sections that hold water. These are the showers that keep slowing down no matter how often the grate is cleaned.

Safe fixes to try first

• Lift the grate and pull out the hair. Gloves on. A cheap plastic hair-removal strip from the hardware store reaches a little further down than fingers can.
• Clean the bath plug or pop-up. Unscrew or lift it out and clear the hair wrapped around it — it’s often the whole problem.
• Use a plunger on the waste. For a bath, hold a wet cloth over the overflow outlet so the plunger can build pressure. A few firm plunges, then run water to test.
• Flush with hot tap water for a minute or two to move light soap build-up.
• Fit a hair catcher once it’s running freely. It’s the cheapest drain maintenance there is.
• Check the other fixtures. Run the shower and watch the floor waste and toilet. If either reacts, skip the plunger and call — the blockage is further down.
• Check the outside gully isn’t covered by garden, mulch or pavers. If water is sitting in it or rising, stop using water inside.

What not to do

• Don’t pour in caustic or chemical drain cleaners. They can damage pipes, they’re a genuine safety risk if they splash back out of a shower base, they don’t reliably dissolve compacted hair, and they leave the waste hazardous for whoever clears it next.
• Don’t mix products. Different cleaners can react with each other in the pipe.
• Don’t force wire or coat hangers down the waste. They can scratch or damage the fitting and push the blockage further in, where it’s harder to reach.
• Don’t open sewer inspection openings to look for the problem. A blocked line can hold sewage under pressure — leave those to a licensed plumber.

When it’s time to call a plumber

• It’s still slow after you’ve cleaned the grate and plug
• The floor waste, basin or toilet gurgles while the shower runs
• Water rises in the floor waste or the outside gully
• You notice a sewage smell in the bathroom or outside
• It keeps slowing down again within weeks of clearing

One slow shower is usually a local job, cleared properly in a single visit. If the bathroom’s other fixtures are joining in, it’s a blocked drain rather than a blocked shower, and worth getting onto before it backs up.

How Zebra finds and fixes it

The right tool for the line. For a blockage close to the plughole, the commercial plunger often does the job. Where hair and scum have built up further along, the chain knocker strips it off the pipe walls and the hydro jetter flushes it clear, so it isn’t back in a fortnight.

Camera when it keeps coming back. If a shower keeps re-blocking, we run the CCTV camera through the waste while you watch, and the pipe locator marks where the problem sits. That shows whether it’s build-up, a dip in the pipe, a corroded section or the main drain.

One fixed price, approved before any work starts. You hear what we found, we quote one fixed price for the fix, and nothing starts until you approve it. The quote is obligation-free.

The honest bit: cleaning or jetting is a long-term fix only when the pipe itself is sound. Where the camera shows a corroded, cracked or badly sagging section, the lasting fix is replacing that section, or relining it where suitable — and we’ll show you why before you decide. Our workmanship is backed by a lifetime labour warranty.

More on sinks, basins and showers on our blocked sinks and showers page.

Whose drain is it?

Everything on your side of the connection point is yours to maintain: the pipes under the house and yard, the overflow relief gully, and — in older suburbs — the boundary trap. Your water corporation (Yarra Valley Water, South East Water or Greater Western Water, depending on where you live) owns the sewer main itself, and the council owns the street's stormwater drains. Older and subdivided blocks sometimes share one combined drain across several properties, and a fault in the shared section is usually a shared cost. We camera and locate the fault first, so you know exactly whose side it sits on before anything is quoted — and if it turns out to be on the corporation's side, we'll say so and point you to their faults line rather than charge you for someone else's pipe. One tip worth acting on today: keep your overflow relief gully (the grated drain outside, usually near a side or rear wall) clear and uncovered. It's designed to spill outside instead of through your bathroom floor, and insurers can take a dim view of a blocked or built-over gully after a sewage spill.

Common questions

More plain-English help in our drain guides.