How to Replace a Macerator Pump (UK)
Swap a Saniflo, Sanicompact or Sanislim macerator. When to repair vs replace, motor and cutter parts.
SanifloGrundfosStuart Turner
Repair or replace?
<5 years — repair. Common failing parts: micro switch, membrane, motor capacitor. >5 years or motor humming without spinning — replace whole unit.
Sizing
- Sanicompact 43 — WC only, 5 m lift.
- Saniplus — WC + basin + shower, 5 m lift, 100 m run.
- Sanibest Pro — heavy-duty, grinds sanitary waste, 7 m lift.
Fit
Isolate power. Isolate cold. Drain the unit (small purge valve). Disconnect all inlets and 40 mm outlet. Fit new unit with a rubber sound mat under.
Frequently asked questions
- Can I DIY a Saniflo?
- Yes for the unit itself. But Building Regs require the discharge to a mains soil stack via a non-return valve — check the whole path.
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