If you flushed your loo (sorry John) and the water board/sewage company/whatever you call them in the US of A called you and said 'Heh, you've just blocked the system because flushing your John dumped 1000 pounds of *%#&¤?§* into the drains, instead of the 1 pound (at a big stretch) any normal person ever dumps". Wouldn't you tell them they were talking crap, because it wasn't possible?