eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

Question

eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

In: 797

Answer 1

My tight french neighbour has rerouted his shower waste into a barrel outside his house, at the top of the barrel there is an overflow which diverts back into the normal wasted when the barrel is full. Before he uses the toilet he goes outside to get a bucket of water so that he can just tip the bucket down to flush. I’ve worked out that all this effort saves him about 20 euros a year …