It’s always confused me why we use our very limited fresh water supply for plumbing & cleaning our vehicles, why can’t we use salt water? We have so much more of it.
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Presumably you could do so on coasts where salt water is plentiful, at least in toilets. You probably would not want to bathe in it. However, it would require an entire new water system that could handle both fresh and salt water. Separate pumping stations, water lines and possibly waste treatment stations. Creating all that infrastructure in most cities would be a massive undertaking that would be incredibly expensive and time consuming.
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