I have a (simple?) theorical question... What is the very minimal slope in order to empty a tub?
I know that (in theory) it could be just 1 degree (if you're patient!)... but in a real world case can it be say 1/8 per foot? 1/16 per foot?
Would the size of the pipe be any concern? a 1 1/4 drain is by code but what if one uses a 2" or even a 3" pipe? Would air displacement be too great that it would cause siphoning all the p-traps around a house?
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