"Mineral" = copper.
It is not now a "better alternative", nor was it 25 years ago when some promoters first started pushing it.
Copper is a good algaecide, a poor bactericide and useless as a viricide, but it's great at staining and turning hair green. It's not inherently a 'scam' but the way it's marketed often is a scam.
Salt (salt water chlorine generation) is a better alternative some things, but not others. It's a GOOD way of feeding chlorine into a pool, but at the cost of increased corrosion, which is a problem on some pools but not others. It is typically cheaper than being repeatedly "Pool Stored", but not cheaper than running a plain BBB method pool with bleach or dichlor.
Ben
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