Bob, That photo you posted, is that your dump bin? I have never seen dump lines with 90 degr. Vertical elbows. It appears to me that you would never be able to fully drain the lines. They would act like traps for black and grey water and possibly even some solids. The other thing to note is that if any spray gets on the slide controller mounted on the back wall, that could create a different problem. Or maybe what I think I see is not really that way at all!?
__________________
|