Every plumber says the same thing about wipes and everybody has heard it enough times to tune it out. It is worth hearing once more if your property drains by pump rather than by gravity, because the consequence is genuinely different and quite a lot more expensive.
In a gravity line, the wrong thing down the toilet builds towards a blockage that someone clears. In a pump it goes into a machine with a spinning part. If you want the short version of how those systems fail, we wrote it up in every fixture stopped at once.
The three Ps, and nothing else: pee, poo and paper. On a pumped property that is not advice, it is the operating limit of the equipment. Anything fibrous wraps the impeller, anything greasy narrows the line the pump has to push through, and neither is a clean-out job.
- Toilet: the three Ps only, wipes included in the ban
- Kitchen: no fat, oil or grease down the sink, ever
- Bathroom: hair out of the waste before it goes down
- Nothing labelled flushable, biodegradable or breaks down
- If you are unsure, it goes in the bin
On this page
1. Why a pump changes the rules
A gravity drain is a pipe on a fall. Things move through it because they are heavier than air and the pipe points downhill. It has no moving parts, which means it has nothing to break. When it fails, it is because something has accumulated.
A pump is a machine sitting in the path of everything that leaves the property. It has an impeller that spins, a float switch that senses the level and a non-return valve that holds the line up between cycles. All three are in contact with whatever you put down the drain.
So the same object has two different consequences. A wipe in a gravity line catches on a joint and starts collecting other things: a nuisance that a plumber clears. The same wipe in a pump wraps around the impeller and stops it turning, and that is a mechanical failure with a mechanical bill.
It is not that Mosman households are worse offenders. It is that the equipment between the house and the sewer is less forgiving, so the same habit costs more.
2. Wipes, including the ones that say flushable
"Flushable" describes what fits down the pan, not what happens afterwards. The problem is that these products are made from long fibres that hold together when wet, which is exactly the property that makes them useful as a wipe and exactly the property that makes them a problem in a pump.
Toilet paper is engineered to fall apart in water within seconds. A wipe is engineered not to. Whatever the packet says about breaking down eventually, eventually is longer than the trip to the pump well.
The same goes for paper towel, tissues, cotton pads, dental floss and anything else that stays in one piece when it is wet. Floss is worth singling out: it is thin enough to feel harmless and strong enough to bind everything else into a rope.
3. Fat, oil and grease down the kitchen sink
Hot fat pours like water and sets like candle wax. It goes down the sink as a liquid, cools in the first few metres of pipe, and lines the inside of the drain. Every subsequent load of fibrous material has something to stick to.
On a pumped property that narrowing matters twice over. It restricts the line the same way it would anywhere, and it also means the pump is pushing against more resistance every cycle, which is wear you are paying for slowly rather than all at once.
Wipe the pan out with paper towel and bin it. Pour cooled fat into a jar. Neither takes longer than running the hot tap, which does not work anyway: the fat simply travels further before it cools.
Drain already slow?
If it is more than one fixture, do not wait for it to stop completely. Call us and we will tell you what we are looking at.
4. The bathroom offenders nobody counts
- Hair. The single most common cause of a slow shower. It collects at the waste and then holds everything else. A five dollar hair catcher removes the problem entirely and needs emptying once a week.
- Soap and product residue. Not a blockage on its own, but it is the glue that binds hair into a mat. Bar soap in particular leaves a film.
- Cotton buds and pads. They do not break down and they are exactly the right size to bridge a bend.
- Sanitary products and nappies. Designed to absorb and expand. Nothing about a pump is prepared for that.
None of these is a moral failing. They are simply things that behave differently in a pipe than they do in a bin, and the bin is free.
5. What it looks like when the pump has had enough
The tell is that everything stops together rather than one fixture getting slower. You may also hear the pump running for longer than usual, or cycling repeatedly, or straining and cutting out. An alarm, if the property has one, is doing exactly its job and should not be silenced and ignored.
A pump that is working harder than it should is a warning you can act on. A pump that has stopped is not a warning, it is the event, and from that point the holding capacity between the house and the well is all you have.
If the pump trips its breaker, something is physically wrong. Repeatedly switching it back on can take a repairable fault and turn it into a replacement.
6. If you rent, or share the system with neighbours
On a shared system the habits of the whole building decide what the pump sees, which means one household can create a bill everybody pays. That is worth raising politely rather than discovering after the fact.
If you rent and the toilet has stopped, that is an urgent repair under NSW tenancy law, and you are not required to wait indefinitely for a reply. Tell the agent, in writing, and keep the record.
- On a pumped property the three Ps are the equipment's operating limit, not a preference.
- A wipe in a gravity drain is a blockage. In a pump it wraps the impeller and stops it.
- Flushable describes what fits down the pan, not what happens after it.
- Fat sets in the first few metres and makes the pump work harder every cycle.
- A pump running long, cycling or straining is a warning you can still act on.
What you can flush FAQs
Are flushable wipes ever safe on a pumped system?
No. The fibres that make a wipe hold together when wet are exactly what wraps an impeller. Whatever the packaging says about breaking down, it does not do it fast enough to matter between your bathroom and the pump.
What about toilet paper, is any type better?
Ordinary toilet paper is fine. It is designed to disperse in water within seconds, which is the whole difference. Thick quilted papers are still fine, they simply take a little longer.
Can I use a drain cleaner as a preventative?
We would not. It does nothing to a jammed impeller or a failed float, it is caustic for anyone who has to work on the system afterwards, and on a pumped property the thing you are trying to prevent is mechanical rather than chemical.
Does a food waste disposal unit cause problems?
It adds fine solids to a system whose job is to move liquid, and on a pumped property that is extra load for no real benefit. If one is already fitted, use it sparingly and never for fibrous scraps or anything oily.
Who pays if the pump jams because of something flushed?
On a private pump the owner does. On a shared system it comes out of whatever the building arrangement is. Either way, establishing what actually caused it is worth doing, because the answer changes the conversation.
Is there a way to protect the pump?
Habits do most of it. Beyond that, a hair catcher on every shower waste, no fat down the kitchen sink, and having the float, valve and impeller checked on a schedule rather than after a failure. Those three checks are the advantage a pumped property has.