CW: Human waste stuff
The chinampas are the meeting ground directly between food production and waste management.
Toilets were basic. A hole in a slab of stone and something below to contain it, but unlike other societies which washed it away or buried it (or dumped it in the streets and caused mass near extinction events via disease), the solids were turned over to the fields and became rich fertilizer for the crops.
The urine was separated out and used as a setting agent for dyed textile.