Dave - i reckon to be saving between 80 and 100 ltrs on a full day - was using a full 400 ltrs but now come back with 50 odd ltrs but have 3 more cleans than before.
it is instant - but most of all hassle free, no fumbles for taps or loops in the pipe or lumps stuck,strapped, glued to the pole so both hands are free and you can hold the pole anywhere you like and still instantly turn off the water.
BM - taps are good, just not as good mate
Darran