# What Not to Flush Down the Toilet | KL Plumbing Handbook > Wet wipes, pads and too much tissue cause most toilet blockages. What not to flush, bidet habits, and signs of a slow build-up. URL: https://klplumbing.my/guide/what-not-to-flush/ Last-Modified: 2026-11-15 Author: KL Plumbing Handbook editors ## The toilet is not a bin Most toilet blockages are caused by something that should not have been flushed. Toilets and the pipes behind them are designed for two things: human waste and toilet paper. Anything else, even things labelled “flushable”, can catch in the bend of the bowl, the pipe under the floor or the shared stack in a condo. This guide lists what not to flush, the habits that help, and the signs of a slow build-up. For blocked toilets and other faults, see the Toilet Problems section [/toilet-problems/ →](/toilet-problems/) . ## What not to flush | Item | Why it causes problems | | --- | --- | | Wet wipes, including “flushable” ones | Break down very slowly, catch in pipes and collect other waste | | Sanitary pads and tampons | Absorb water and swell | | Nappies | Swell hugely and block at once | | Cotton buds and cotton wool | Clump together in bends | | Kitchen paper and facial tissues | Made to stay strong when wet | | Dental floss | Wraps around other waste | | Hair | Tangles and traps paper | | Cooking oil and food | Sets in pipes and attracts more waste | | Medicines | Harm the water and sewer system | | Cat litter | Sets like clay | ![Bidet spray hanging on its holder next to a toilet in a Malaysian bathroom](/images/content/bidet-spray-hanging-on-its-holder-next-to-a-toilet.webp) ## Toilet paper: how much is too much? Even toilet paper can cause a blockage if too much goes down in one flush, especially with a low-water dual-flush cistern on the half flush. If you use a lot of paper, flush part way through, or use the full flush. ## Bidet spray habits Many Malaysian bathrooms have a bidet spray beside the toilet. Using it for most of the cleaning means far less toilet paper, which helps. A few habits keep it working well: - Close its valve when the house is empty for long periods, so a failed hose does not flood the bathroom. - Do not leave the spray head lying on the floor, where it can be stepped on and crack. - If the hose drips, replace it early. Our Taps and Fixtures section [/taps-and-fixtures/ →](/taps-and-fixtures/) covers spray leaks. ## A bin solves most of it Put a small bin with a lid next to every toilet. It is the single most effective way to stop blockages, because people flush things when there is nowhere else to put them. If blockages keep coming back even with good habits, Repair or Replace a Toilet? [/guide/repair-or-replace-toilet/ →](/guide/repair-or-replace-toilet/) explains when replacing an old toilet is worth considering. ![Small pedal bin with a lid placed beside a toilet in a Malaysian bathroom with a roll of toilet paper on the holder](/images/content/small-pedal-bin-with-a-lid-placed-beside-a-toilet-.webp) ## Signs of a slow build-up Blockages often build up over weeks. Watch for: - Water rising higher in the bowl than usual before it drains - A slow, weak flush, or needing two flushes - Gurgling from the toilet or a nearby floor trap - Bubbles rising in the bowl when another fixture drains - A smell that was not there before Act at this stage. A plunger used early often clears a partial blockage before it becomes a full one. ## Household rules for tenants and guests Tenants, guests and helpers may not know your rules. A short, polite note helps more than you might expect. - Put a simple sign in each bathroom: “Only toilet paper in the toilet. Please use the bin.” - Landlords can include the same rule in the house rules attached to the tenancy agreement. - Show new tenants where the bins are at handover. This also helps when there is a question of who pays. Blockages caused by misuse, such as wipes or sanitary items, usually fall on the tenant under typical tenancy terms. Our guide on a blocked toilet in a rental [/guide/blocked-toilet-rental-who-pays/ →](/guide/blocked-toilet-rental-who-pays/) explains that in more detail. ## Landed house and condo notes **Landed house.** Your own pipes run to the sewer connection or septic tank. Wipes and pads that get past the toilet can still block an inspection chamber outside. **Condo unit.** Your toilet drains into a shared stack. What you flush can block the stack below your floor and push waste water back into your neighbours’ floor traps. Good habits protect the whole building. ## When to call a plumber Call a plumber if the toilet stays blocked after you have tried a plunger, if water rises to the rim, or if blockages keep coming back. Repeat blockages can point to something stuck deep in the pipe, a badly sloped pipe, or a problem in the shared line. Ask the plumber to tell you what they found, and to photograph it if you rent the property. ## Questions people ask Are 'flushable' wipes safe to flush?expand\_more They are a common cause of blockages. Wipes labelled flushable break down much more slowly than toilet paper, so they catch in traps and pipes and collect other waste. Put them in a bin instead. Does using a bidet spray help?expand\_more It can. Using the bidet spray for most of the cleaning means less toilet paper goes down the toilet, which lowers the chance of a blockage, especially in older or low-flush toilets. What are signs of a slow blockage?expand\_more Water rising higher than usual in the bowl before it drains, a weak or slow flush, gurgling sounds, and needing two flushes to clear the bowl. These signs usually build up over days or weeks. Can I flush kitchen paper or tissues?expand\_more No. Kitchen paper and facial tissues are made to stay strong when wet, which is the opposite of what toilet paper does. Put them in the bin. Keep reading Learn more about toilet problems Blocked toilet bowls, weak or running flush, leaking cisterns and toilet bowl replacement. Open the Toilets section [/toilet-problems/ →](/toilet-problems/) About the authors KL Plumbing Handbook editors The KL Plumbing Handbook editors write plain-language guides on home plumbing problems, repair costs and hiring a plumber for homes in Kuala Lumpur and the Klang Valley. Each guide covers one problem and states the source and date of every cost figure. Spotted an error? Send a correction [/contact/ →](/contact/) . See our editorial policy [/editorial-policy/ →](/editorial-policy/) . ## Related guides Repair or Replace a Toilet? Fix the cistern or change the bowl? Repairable parts vs cracked or old bowls, cost factors with KL1 Plumber's dated prices, and water use. Read guide arrow\_forward [/guide/repair-or-replace-toilet/ →](/guide/repair-or-replace-toilet/) Replacing a Toilet Bowl: What to Expect What happens when a toilet bowl is replaced: removal, seal, outlet alignment, squat-to-pedestal conversion, condo approval and downtime. Read guide arrow\_forward [/guide/toilet-bowl-replacement-what-to-expect/ →](/guide/toilet-bowl-replacement-what-to-expect/) Toilet Not Refilling After a Flush A cistern that will not refill is often a closed valve, a fill valve clogged with sediment after a water cut, or low supply pressure. Read guide arrow\_forward [/guide/toilet-cistern-not-refilling/ →](/guide/toilet-cistern-not-refilling/) Toilet Cistern Running Non-Stop Why a cistern keeps filling: float or fill valve, flush valve seal, stuck dual-flush button. Checks you can do, and when to call. Read guide arrow\_forward [/guide/toilet-cistern-running-non-stop/ →](/guide/toilet-cistern-running-non-stop/)