A float fitted to the valve in a WC or CWST. When the tank is filling the float always rises to the top.
Floaters. Why is it that it's only plumbers that leave one of them hanging around the customer's bog? None of the other trades do... Haven't they sussed out what the bog handle's for?
the cream of course, thats me, but you always have some cream coated turds bobbing about, thats the others.
What always rises to the top? AIR Rubbish! One example helium is lighter than air, so it will rise above air. Grow up. Loo