If we pumped salt water onto land, would it filter the salt out while adding to our underground water source?
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Not really. The salt is dissolved. The only way to really separate it is to get it out of solution, which is pretty energy-intensive. You either have to distill it or force it through reverse-osmosis.
I mean, solar evaporation has been used for thousands of years by getting saltwater to flow into shallow pools… but that’s for gathering salt, usually, not water.
Even if it did work, you’d end up with a patch of ground that’s contaminated with huge amounts of salt (salt disposal is one of the biggest environmental concerns around desalination in general, apart from the energy use).
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