The Saniplus works on a float switch which is a rubber membrane in the pressure chamber (where electrical components are) water pressure pushes up in the membrane and the unit kicks on and pumps the waste out. Once the pressure releases, the membrane goes back down and shuts off. If the membrane is warped or solids are build up at the bottom, it will not allow it to kick on and off as it should. You might want to inspect that membrane and have it cleaned or replaced.
SOURCE: My saniflo toilet wont flush
You need a new capacator. The motor is trying to run but does not have enough electricty to get the motor up to full speed.
SOURCE: Our Saniflo - Saniplus works fine and efficiently
Sounds like a restriction in the outlet pipe, the 2 galls from a flush are OK but the bath or shower is more, especiallly if you have flushed before you shower, try drain unblocking chemicals or flushing the outlet pipe with mains water from a hose
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