Macerator and Saniflo Installation and Repair in Milton Keynes
Tell Us About the Job
Tell us about the job in two minutes and we’ll come back to you with a clear, fixed price.
A macerator lets you put a toilet somewhere a toilet cannot normally go. That is genuinely useful, and it is why loft conversions, basement rooms, garage conversions and awkward downstairs cloakrooms exist in properties where the soil stack is in the wrong place.
It is also a pump with a motor and moving parts installed behind a toilet, which is a fundamentally less reliable arrangement than a pipe with a fall in it. Anyone who tells you otherwise is selling you one.
We install and repair macerators across Milton Keynes and the surrounding towns. Gas Safe registered, registration number 981362.
A note on the name: Saniflo is a brand, and it is the one most people use as the generic term, in the way people say Hoover. We work on macerators from the various manufacturers.
- Gas Safe registered 981362
- Fixed price agreed before we start
- Milton Keynes and 20 miles around
- 8am – 8pm, Mon to Sat
Last updated
How it works
Waste enters a sealed unit behind or beside the toilet. A motor drives blades that break down solids, and a pump then pushes the resulting slurry through a small bore pipe, typically 22mm or 32mm, to wherever the nearest suitable connection to the drainage system is.
Because it is pumped rather than gravity fed, the discharge pipe can run uphill, which is the entire point. It can lift waste several metres vertically and then run horizontally to a stack.
Larger units also take a basin, a shower and sometimes a bath, which is what makes a full loft or basement bathroom possible.
When it is the right answer, and when it is not
Right answer when:
- There is genuinely no route for a gravity waste with adequate fall
- The alternative is structural work costing several times more
- You are converting a loft, basement or garage where the stack is nowhere near
- You are adding a cloakroom under stairs or in an awkward corner
Not the right answer when:
- A gravity route exists and is simply less convenient. Always choose gravity if you can
- It is the only toilet in the property. A macerator failure with no alternative toilet is a genuine problem, and they do fail
- Nobody has thought about power. It needs a permanent, protected electrical supply, and it does not work in a power cut
- The users will not accept the restrictions on what goes into it
That last one is the real determinant. A macerator in a family home where nothing but toilet paper goes down it will run for years. The same unit in a house where wipes go down it will fail, repeatedly.
What can and cannot go in
Can:
human waste and toilet paper. That is the list.
Cannot:
wet wipes of any description including those labelled flushable, cotton wool, cotton buds, sanitary products, nappies, kitchen roll, dental floss, condoms, hair in quantity, cooking fat, or anything else at all.
Bleach and strong chemical cleaners are also worth avoiding, since they degrade the seals and the rubber components. Use the descaler the manufacturer recommends.
If a macerator is going into a rental property or a house with guests, put a small sign on the wall. It sounds excessive. It is considerably less excessive than the alternative.
What goes wrong
Blockages
The dominant failure, and almost always something that should not have been in there. Symptoms are the motor running longer than usual, running repeatedly, or running without the water going away.
Scale, which matters here
Milton Keynes water averages around 300 mg/l of calcium carbonate through Anglian Water, with MK8 at roughly 317 against a UK average of 207. Scale builds inside the unit and inside the small bore discharge pipe, gradually reducing the bore until the pump cannot shift the volume.
This is why regular descaling is more important in Milton Keynes than the manufacturer’s general advice implies. A unit descaled on schedule lasts substantially longer here than one that is not, and the descaling interval that suits average UK water is not the interval that suits this water.
Motor failure, phantom cycling and smells
The motor or pump fails.
They are consumables. Membranes, seals and impellers wear. Many units are repairable with a service kit rather than needing full replacement, and it is worth asking which you are being quoted for.
It runs when nobody has used it.
Usually a leaking toilet valve trickling water into the pan, which fills the macerator and triggers it. Fix the toilet, not the macerator. The toilet page covers the food colouring test that identifies this.
It smells.
Usually the seals, or a discharge pipe that has partially blocked and is holding waste.
The discharge pipe decides reliability
This is the design detail that separates a macerator that works for a decade from one that is trouble from the start.
Vertical first, then horizontal.
The pump lifts the waste up, and then it runs across with a slight fall to the stack. You cannot run horizontally and then go up, because the waste sits in the horizontal section and the pump has to shift a standing column every time.
Vertical lift and horizontal run trade against each other.
Every manufacturer publishes a curve: the more you lift, the less horizontal distance you get. Designing to the edge of that curve produces a unit that works when new and struggles once any scale forms.
Fall on the horizontal section.
A slight continuous fall towards the stack, no dips, no sags between supports. A dip holds waste and becomes the blockage point.
Sensible pipe routing.
Long runs with multiple bends add resistance. Every bend is a place scale collects.
A macerator installed by someone who designed the discharge properly is a different product from one installed by someone who ran the pipe wherever was easiest.
Macerators in Milton Keynes: the local picture
Loft conversions across all the estate types. The most common macerator installation in this city, because getting a gravity waste from a second floor to a stack is frequently impossible without major work. Our loft conversion page covers the wider project.
1970s estates, Beanhill, Coffee Hall, Netherfield, Fishermead and Conniburrow. Fixed stack positions and compact layouts, so added cloakrooms and en-suites often need one.
Garage conversions, common across the 1980s and 1990s estates including Furzton, Emerson Valley and Shenley Brook End. The garage is invariably the furthest point from the stack.
Older property in Stony Stratford, Newport Pagnell, Olney and Wolverton. Solid floors and original drainage, where breaking out for a gravity run is genuinely disruptive.
Keeping one alive
- Nothing but human waste and toilet paper. No exceptions, including flushable wipes
- Descale on a schedule, using the manufacturer’s product, and more often here than the general guidance suggests
- Avoid bleach and strong chemical cleaners
- Fix any leaking toilet valve promptly, so the unit is not cycling unnecessarily
- Keep the unit accessible. One boxed in with no access panel is one that cannot be serviced
- Have it serviced periodically rather than waiting for failure
- If it is the only toilet in the property, have a plan for when it fails
Frequently asked questions
Are macerators reliable?
Correctly installed, correctly used and descaled on schedule, yes, for many years. Badly installed or misused, no. The discharge pipe design and what goes into it decide almost everything.
Can I put a shower and basin into one?
Larger units take a basin, shower and sometimes a bath. Tell us what the room will contain so the right unit is specified.
Can I flush wipes if they say flushable?
No. They are the single most common cause of macerator failure.
Why does mine keep running on its own?
Usually a leaking toilet flush valve trickling into the pan. Fix the toilet and the macerator stops cycling.
How often should it be descaled?
More often than the general guidance suggests, because of the water hardness here. We will give you an interval based on the unit and your usage.
Can it be repaired or does it need replacing?
Many units are repairable with a service kit. Worth asking which you are being quoted for before agreeing to a replacement.
Does it work in a power cut?
No. That is a reason not to make one the only toilet in a property.
Do you install macerators in rental properties?
Yes, and we would recommend a notice in the room about what can be flushed. It reduces callouts noticeably.
You may also need
Get it specified properly
Call 07514 312117 or send a WhatsApp describing the room and where the nearest stack is. Gas Safe registered 981362, CIPHE member, fully insured.