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If the flow out is straight down the 40mm waste pipe and the shower and sinks have non-return valves in the waste, will that not prevent a nasty shock?

Unfortunately there is no ground pipework nearby outside and trying to run it in 100mm waste pipe to conect to the stack would mean running through a conservatory to maintain the gradient, so not really an option! Sounds like running it straight down into the 40mm waste pipe should be OK. I had...

I am installing an ensuite into a bedroom above our downstairs utility room. I need to use a saniflo for the toilet because there is no 100mm stack pipe above the utilty room or conveniently close to the bedroom. However, I can connect the waste from the sink and shower straight down into a 40mm...