Indeed, but the aquabian thing does use something.
if I want to shower in sea water,
No, I don't. I have had a look at the Wikipedia entry and Googled extensively (e.g. HERE and HERE). None of that really helps but it does suggest that water softeners work by substituting salt for hard minerals such as calcium, magnesium, and iron.So you don't know how [hard water softeners] work then![]()
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