Poop is mostly water - assuming your diet is anywhere near normal. Most of the recognizable shapes break up in the black tank as things slosh around. The function of a macerator - whether it be a chopper pump or a high pressure venturi - is to completely break up whatever is left - think garbage disposal - and push it on to the sewer. As seen in the video - brownish water with small chunks in it ...
I have worked in the sewer industry for over 30 years, and what ends up coming to the sewer plant looks a whole lot different than what you flush down .....
