U
Unregistered
My plumber has come up with this solution to an admittedly tad complex piping challenge. But I cannot see how the horizontal section will not result in waste accumulating there, on the main channel temporarily due to lack of maximum flush pressure; and on the inspection arm simply as it's a, horizontal, dead end. Also if bits of waste stuck on the horizontal section on the first flush are cleaned away on the second, won't they then just accumulate at the bottom of the stack, again due to lack of strong flow pressure?