Terryc wrote:
What a thick dipstick.
So, what is the difference between the water running continuously in the
hand basin whilst you shave and/or clean your teeth and it running
continuously in the shower for the extra time it takes to shave and/or
clean your teeth,.

The idea is that you don't run the water continuously while shaving
or brushing your teeth. You brush/shave first, then rinse. It does
add up to quite a lot. I probably waste a litre or two a day brushing
my teeth in the shower.