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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The question of treatment and discharge becomes a problem. With fresh water, once the waste is removed or treated, it can be discharged to any river or common water source. With salt water, it would be extremely difficult to remove the waste (for related reasons, bacteria that break down human waste do not like salt) *and* the salt before it’s discharged to an otherwise freshwater river.
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