A question I have had on this topic is can you actually waste water? It is either turned to steam and enters the atmosphere or goes down the drain. If it is grey it goes into the bow and nature cleans it, if it is black then it goes to the treatment plant. I understand that energy can be wasted to heat, transport (so to speak) and treat water but is the water ever actually wasted?
Obviously, if chemicals are introduced it can affect downstream users and need to be cleaned, another energy hit, but the water itself is still viable, no?
Am I way off and missing something?
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