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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You would need to make two sets of pipes going into every single building, one with salt water, and one with fresh water. And that would only be useful for places near coasts that had a lot of salt water available. Likewise, pipes that carry saltwater need to be replaced far more often, as the salt corrodes the metal pipes.
It’s a lot of hassle, and isn’t seen as worth the expense.
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