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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Because the amount of work that would it would require to plumb every house with a potable and non-potable water source just for the toilet far outweighs the rewards. Salt water is also far more corrosive than fresh water so pipes would have to be either made from plastics or be replaced regularly. Also, waste water treatment plants are designed to process dirty fresh water, not salt water; salt is very costly to remove which is a problem since waste water treatment plants discharge their water back into rivers; the added salinity would wreak havoc on local ecosystems.
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