"IMM" wrote in message ...

If the basin was not used much, the toilet cistern may run out of water. You
need at normal water supply to the cistern in case. Then how do you
prioritise? How do you use fresh water to fill when no grey water? having a
normal ballcock will mean fresh and grey water fill at the same time. You
would need a separate grey water tank.


You've got 2 fills, the mains with ballcock as usual, plus sink waste.
So it fills even if you never wash your paws.

With mains fill at full speed, there is grey water use for a minute or
so after flush. If you want to capture 100% of grey for longer you can
slow the mains fill, if you wish. Very simple, works. No tank, or all
the costs associated with it.


Regards, NT