That's pretty common with all their MSDS's, some legal loophole someone mentioned, to not be forced to disclose anything that the sheet is really for in the first place, makes no sense to me.
"Soft" or "hard" water actually has to do with general hardness, not alkalinity, acidity, or pH, in that case the word softening is a misnomer and is part of the hobby epidemic where people are chasing a certain pH thinking they're softening their water, when they should be lowering general hardness through dilution, RO etc, rather than battle KH with acid. When a species profile lists "soft water", that means the general hardness of their natural locale is low, or in the soft range. When fishbase lists dH they're literally listing dGH. Some profiles are just caught up in the pH myth and list a recommended pH they picked up somewhere, probably not worth paying attention to, others might accurately list a fish from more acidic environments.
People add acid to neutralize carbonates and bicarb, to fight the buffering of KH, problem is you have to add even more to neutralize the bases and get it down even further than 7. Nasty. In the first paragraph on their product page, Seachem is explaining a dual purpose product... "adjusts pH to the acidic range (4.5 – 5.5) and softens water by precipitating calcium and magnesium. It's probably a combination of acid for KH and pH, and another one of their "accidental" lab discoveries for dealing with GH.
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