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this post was submitted on 15 Feb 2024
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Chemistry
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Even stainless steel will corrode, and salt especially will speed up the process. Solid salt is much worse than salt water, because the concentration of solid salt is 100% vs a fraction of a percent for pasta water. Regardless, leaving salt water sitting in your pot for days on end is definitely going to make corrosion occur faster, although by how much I can't say.
Although, I will say that needing to buy even one additional pot might offset any environmental benefit from reusing your pasta water. Industrial manufacturing uses a ton of water, so if your goal is to preserve it, you're likely better off just washing & drying your pot out between uses so that it lasts longer.
I could always transfer it to glass or plastic to protect the pot but I guess laziness was the original motivator. Salt is cheap enough that I’ll probably just toss it going forward.