On Jan 5, 4:43*am, CS wrote:
Just fit an inexpensive domestic water meter. *Most have 3/4 inch
fittings and will cope with 3 m3/hour flow rate. *It is accurate
enough and I have one fitted just before the water pump inlet, with
its meter face poking through the galley deck. *Easy enough to read
weekly and work out how much water is left.

CS

Yes that looks like the most practical solution. Do you know the
manufacture of the one you have.

Thanks