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  • I would worry about splash back onto the "gun" itself. Like toilet brushes, I don't think I trust other people to keep the cleaning thing itself clean.

  • No it's if it can drop into the toilet bowl and siphon water from there into the freshwater supply. There's a rule for not fitting handheld showers where they can drop into the loo but people forget when retrofitting bum guns.

  • Surely you can fit a non return valve to the supply. The same way that is required with mixer taps to prevent cross contamination.

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