Originally Posted by ggray
....Is it always best to ensure there is no dip?
I understand the matter of hose permeation, but the dip, if deep enough to completely fill the hose, will function like a sink trap to block sewer gases.....
I don't believe the space between the bottom of the bowl and the pump, which in our case is a macerator, is ever fully empty. A dip in the line is going to permeate eventually. l would rather leave an inch of clean water in the bowl if this was an issue.
That space below the bowl is the easiest to insure has clean water in it, especially when away for a few days and we flush a couple of bowls of fresh water from the sink, instead of sea water.