Non return valves (supplied) should be fitted to the outlet as near as possible to the outlet on the macerator as possible.

Keep any bends in the discharge pipework to an absolute minimum and should be 45 degree x 2 if necassary avoid 90 degree bends.

When installing always "power on" prior to allowing water/waste to enter the macerator.

Discharge/outlet pipe must be 32 or 40mm no smaller (Maxiflow 1, 2 & 3) all the way through to the soil pipe - do not restrict the flow

Water backing up in the toilet or shower?
Resolve by resetting the air switch. Hold button down on the top of the unit for 40 secs & release