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jellybaby-
I think of a saniflo as a loo macerator but maybe it’s just a pumped waste system, as you say.
These days such a system needs an alarm to stop failures causing a flood but if it’s an old install who knows what the setup is, especially as it seems the pump is on the same ring as the hall light…
Sounds like a rubbish system, but it worked fine until the builder filled the electrics with levelling compound so if the building insurer could be bothered I’m sure they could pursue the builder for his mistake.
Hefty
Water wants to find its level. Assuming it is all connected to the same waste then the level of the water in the bath will be quite a bit higher than the level of the water in the Saniflo and the toilet.
But that would assume that all of the waste (including the bath) goes through the Saniflo. No sane setup would have that surely...