Macerator Toilet Installation & Specialist Waste Plumbing

What is a macerator?

A macerator is a compact pump installed behind or beside a toilet. It breaks down waste before pumping it through a smaller discharge pipe to the main drainage system.

They are commonly used where installing a standard gravity soil pipe would be difficult or excessively disruptive.

Typical locations include:

• Downstairs cloakrooms
• Under-stair toilets
• Garage conversions
• Utility rooms
• Basement rooms
• Garden offices
• Loft conversions

A macerator should only be installed where it is genuinely the most suitable solution.

Macerator services Rez can help with

Typical work can include:

• New macerator installation
• Like-for-like replacement
• Saniflo replacement
• Waste pipe alterations
• Water supply pipework
• Isolating and reconnecting existing units
• Fault investigation
• Advice on suitable replacement models
• Plumbing for new cloakrooms
• Specialist waste arrangements

The correct solution depends on the existing pipework, available drainage route and access.

When is a macerator the right choice?

A conventional toilet connected directly to the soil stack is usually the preferred solution.

However, a macerator may be appropriate when:

• A gravity soil pipe cannot be installed
• Structural alterations would be excessive
• The toilet is a long distance from the soil stack
• The room is below the existing drainage level
• A compact cloakroom is being created
• Pipework needs to remain discreet

Every installation should be assessed individually.

Common macerator problems

Typical faults include:

• Motor runs continuously
• Unit will not start
• Loud or unusual noises
• Slow discharge
• Water leaking around the unit
• Blocked discharge pipe
• Failed non-return valve
• Electrical supply issues
• Internal component failure

The fault should be diagnosed before replacing the complete unit.

Can a macerator be repaired?

Sometimes.

Repairs may be possible where:

• A connection has leaked
• A discharge pipe has become blocked
• The fault is external
• A serviceable component has failed

Replacement is often the better option when:

• The unit is heavily worn
• Internal components are damaged
• Spare parts are unavailable
• The motor has failed
• The unit has leaked internally
• The installation is several years old

A like-for-like replacement is often the most economical long-term solution.

Waste pipework matters

A macerator installation depends just as much on the waste pipework as the unit itself.

Before installation, Rez considers:

• Pipe diameter
• Pipe length
• Vertical lift
• Horizontal run
• Number of bends
• Discharge route
• Isolation
• Future maintenance access

Poor waste pipe design can reduce reliability and shorten the life of the unit.

Choosing the correct macerator

Different macerators are designed for different applications.

Some units accept:

• Toilet only

Others also accept:

• Basin
• Shower
• Bidet
• Bath

Choosing the wrong model can create performance problems later.

The proposed sanitary fittings should always be known before selecting the unit.

What should never go into a macerator?

Only:

• Toilet paper
• Human waste

Items that commonly cause damage include:

• Wet wipes
• Kitchen towel
• Cotton buds
• Sanitary products
• Nappies
• Dental floss
• Cleaning cloths
• Grease
• Food waste

Even products labelled "flushable" may damage or block a macerator.

Photos that help with an assessment

Useful photographs include:

• Complete macerator
• Toilet
• Pipework
• Waste discharge
• Water supply
• Surrounding room
• Access
• Existing plumbing
• Manufacturer label

Please also send:

• Property postcode
• Whether the unit still runs
• Whether water leaks
• Approximate age
• Model if known

FAQs

Frequently asked macerator questions