Earlier quoted context omitted.
>>Western toilets aren’t the answer, because they require a massive infrastructure of sewer lines and treatment plants that just isn’t feasible in many poor countries. Then build it! No magic tricks there. I think, this is the most infuriating trait I see in all Silicon Valley "sophisticated person" types.
I'm not a civil engineer but I do work with them occasionally. There are numerous challenges with this, probably the hardest is water pressure: if the water pressure cannot be guaranteed then poor plumbing can send waste water back into the water main, which is a really big problem. I also assume that to ensure water pressure involves electricity - a lot of poorer countries do not have a constant or reliable electric…
Today water pressure in the western world is mostly generated by running finely controlled electric pumps constantly, but it wasn't too long ago that water towers were used everywhere to maintain water pressure. The advantage of a water tower is that you can run an inaccurate oversized pump occasionally to fill up the reservoir on top of the tower, and gravity does the rest of the work.
Of course building a tower capable of holding many tons of water is a comparably complex civil engineering task and is costly in materials.