The product is marketed for salt and fresh - thus my question
A number of companies sell products for both salt and fresh, and when making claims, rarely (and perhaps too conveniently) do they distinguish the two scenarios despite them sometimes having different results.
Chemipure by Boyd is a case in point, but even ignoring the lack of fresh vs salt distinction for the effects of things like their ion exchange resin in chemipure blue, they make other unbelievably stupid claims:
chemi-pure.com
"Chemi-pure does not remove trace elements and is the only filter medium which aids in the natural balance of positive and negative charges, with an emphasis on the beneficial negative ion. "
"REMOVES TOXIC ELEMENTS – Including Copper & Phenol"
So copper is removed, or not?
Seriously? We need to work to attain charge balance? Did they forget that nature already provides charge balance? The beneficial negative ion? which one is that? Do tell. lol
chem.libretexts.org
"This equation is known as a
charge balance. It is important to realize that all solutions must be electrically neutral; that is, for every substance of positive charge there must be an equivalent amount of negative charge to balance it out. If something dissolves in water and produces positive ions, then there must be negative ions around to balance them out."