eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?
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An interesting question! Water is, as far as I know, classified into three types. Clear water is that which is unsullied. Think of Spring Water, Well Water, Bottled Water, etc. Grey Water is any water that has been used before but does not have any toxic chemicals or excrement. Black Water is everything else. The regulatory bodies of our country have deemed that Black Water can never come back to a human again as we have no 100% guaranteed filtration systems. Also it’s gross.
Grey Water, on the other hand, can be and is reused. For example, after special filtration to get out soap and dirt and such, Grey Water can be used to water a lawn or to fill ballast to name just two. I once worked on a contained habitat project where the Grey Water was to be recycled for the plants they were growing for food.
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