I've been trying to think of creative ways to save on water usage, and one way I thought of was to collect graywater from showers or washing dishes to use for flushing the toilet to reduce # of flushes.
However, I have heard that there are bacteria that are beneficial to our drainage systems. Apparently Drano can be pretty harmful to that bacteria. I understand that Drano is pretty aggressive as an example, but what about the variety of shampoos, conditioners, and soaps from showers and dishwashing? Can't those be potentially harmful the normal bacteria specific to toilet drainage systems?