"Flushable" Wipes Aren't: What Really Happens in Your Pipes
They say "flushable" on the packet. Your plumber says otherwise. Here's what actually happens after you hit the button.
Every Sydney plumber has seen it
You pull up to a job, the homeowner swears they have not put anything unusual down the drain, and then you start pulling out long, matted ropes of wet wipes from their sewer line. The packet said "flushable." The pipes say something very different.
If you use wet wipes and flush them, you are not alone. An estimated one in four Sydney residents regularly flush wet wipes down the toilet. But that small, everyday habit is behind some of the most expensive and unpleasant plumbing disasters we deal with at SPS Plumbing.
This post breaks down what actually happens inside your plumbing when a so-called flushable wipe goes around the S-bend, why the word "flushable" does not mean what you think it means, and what you can do to protect your home.
The Word "Flushable" Is Misleading
Here is the simplest way to think about it. As Sydney Water spokesperson Peter Hadfield told CHOICE: "Technically my phone is flushable, but that doesn't mean it should go down the toilet."
Just because a wipe physically leaves your toilet bowl does not mean it will safely travel through your pipes, your property's sewer line, and the public wastewater network without causing damage along the way.
While Australia introduced a new flushability standard (AS/NZS 5328:2022) for wipes that meet specific break-down criteria, the reality on the ground has not caught up. The vast majority of wipes sold in supermarkets still do not meet that standard, and Sydney Water continues to urge residents to stick to the "3 Ps" rule: only flush pee, poo, and (toilet) paper.
What Happens Inside Your Pipes
Engineered to fall apart. Drop a sheet into a glass of water and watch it dissolve within about 30 seconds. Turns to mush almost immediately, flows freely through pipes without catching on joints, bends, or rough spots.
Engineered to do the opposite. Designed to hold together when wet, that strength is the whole selling point. But that same strength is exactly what makes them a disaster inside a plumbing system.
Once flushed, wipes travel slowly through your household drains. Along the way, they can:
- Snag on pipe joints, tree roots, or rough patches inside older clay or PVC pipework
- Tangle together with other wipes, hair, dental floss, and sanitary products to form dense, matted clumps
- Collect grease and cooking fats that have been tipped down the kitchen sink, binding into a solid, cement-like mass
- Sit and build up over weeks and months, gradually narrowing the pipe until nothing gets through
The Numbers Tell the Story
This is not a niche problem. It is one of the biggest ongoing headaches for both homeowners and water utilities right across Sydney.
CHOICE Put "Flushable" Claims to the Test
CHOICE tested 12 brands of wipes: 11 labelled as "flushable" and one labelled "do not flush." They placed them in an agitation device designed to simulate conditions inside a sewer pipe and ran it for six hours.
The results were telling:
- Toilet paper started breaking apart within minutes and fully disintegrated, leaving nothing but milky, opaque water
- Every single wipe, including all 11 "flushable" brands, remained largely intact after six hours with no sign of truly breaking up or losing structural strength
Sydney's Fatberg Crisis: Closer Than You Think
In late 2024, thousands of dark, foul-smelling debris balls began washing up on Sydney's eastern beaches, closing Coogee, Bondi, Maroubra, and more than a dozen other beaches over several months.
The cause? A giant fatberg lodged inside Sydney Water's Malabar deepwater ocean sewer, estimated to be the size of four city buses. A confidential Sydney Water report obtained by The Guardian revealed that in April 2025 alone, crews removed 53 tonnes of accumulated fats, oils, grease, and debris from the accessible section of the system. The full blockage, trapped in an inaccessible chamber 20 metres underground, could not be fully cleared without shutting down the outfall for months.
Fatbergs form when flushed wipes combine with fats, oils, and grease that have been poured down kitchen sinks. The wipes act as a net, trapping the fats and binding everything into a dense, hardened mass that can grow to fill an entire pipe. The Malabar fatberg grew so large it began spitting chunks out to sea during heavy rain, which washed back to shore as the debris balls that made national headlines.
A straightforward blocked drain cleared early is a routine job. A pipe that has been narrowed by months of accumulated wipes and grease may need CCTV inspection, high-pressure jetting, or in severe cases, excavation and pipe relining.
What Should You Flush? The Three Ps
Sydney Water and every water utility in Australia give the same advice. The only things that should ever go down your toilet are:
- Pee
- Poo
- (Toilet) Paper
Everything else goes in the bin. That includes:
- Wet wipes (even if labelled "flushable")
- Baby wipes
- Makeup removal wipes
- Cleaning wipes
- Cotton buds and cotton pads
- Sanitary products
- Dental floss
- Paper towels and tissues
Signs You May Already Have a Wipe Blockage
If you have been flushing wipes for a while, keep an eye out for these warning signs:
- Slow-draining toilet that takes longer than usual to empty after flushing
- Gurgling sounds coming from drains or the toilet when water runs elsewhere in the house
- Sewage smell near floor drains, in the laundry, or in the backyard
- Water backing up in the shower, bath, or floor waste when the toilet is flushed
- Wet patches in the yard near where your sewer line runs
What SPS Plumbing Can Do
At SPS Plumbing, blocked drains caused by wet wipes are one of the most common jobs we attend across Sydney. With four fully equipped vehicles on the road seven days a week, we can get to you fast.
Here is how we handle it:
- Same-day service guaranteed when you call before 10:30am
- CCTV drain camera inspection to locate the exact blockage point
- High-pressure water jetting to break apart and flush out wipe build-up
- Pipe relining for pipes that have been damaged by persistent blockages
- Upfront pricing before we start, no surprises on the bill
- Interest-free payment plans available for larger jobs
Frequently Asked Questions
Are flushable wipes actually safe to flush?
No. Despite the label, flushable wipes do not break down the way toilet paper does. CHOICE tested 11 flushable-labelled brands and found every single one remained largely intact after six hours of agitation simulating sewer conditions. Sydney Water confirms wet wipes contribute to 75% of all wastewater blockages in their network.
What is the Three Ps rule?
The Three Ps rule is Sydney Water's guidance for what should go down your toilet: only Pee, Poo, and (toilet) Paper. Everything else, including wet wipes, baby wipes, cotton buds, dental floss, and sanitary products, belongs in the bin.
How much can a blocked drain caused by wet wipes cost to fix?
Sydney Water reports that one homeowner incurred a $16,000 plumbing bill after a wet wipe blockage damaged their private wastewater pipes. Even a routine blocked drain cleared early is far cheaper than excavation or pipe relining caused by months of wipe build-up.
What are the warning signs of a wet wipe blockage?
Key signs include a slow-draining toilet, gurgling sounds from drains when water runs elsewhere in the house, sewage smell in the laundry or yard, water backing up in the shower or bath when the toilet is flushed, and wet patches near where your sewer line runs underground.
What is a fatberg and can it happen in my home?
A fatberg forms when flushed wipes combine with fats, oils, and grease poured down kitchen sinks, binding into a dense, hardened mass. A giant fatberg lodged in Sydney Water's Malabar sewer reached the size of four city buses by 2026. Smaller versions of the same thing can build inside your own household pipes, the warning signs are a slow-draining toilet, gurgling drains, or faint sewage smell.
Does SPS Plumbing offer same-day service for blocked drains?
Yes. SPS Plumbing guarantees same-day service for calls received before 10:30am across Sydney. With four fully equipped vehicles on the road seven days a week, they handle blocked drain jobs using CCTV inspection, high-pressure water jetting, and pipe relining where required.
Got a slow drain or a blockage?
Call us on (02) 9072 0760 or book online. We will sort it out quickly and let you know exactly what we find. Upfront pricing, no hourly rate, same-day service available.
