Erm...I cannot be 100% sure but from my limited understanding, Mosura softwater is ion exchange resins. It exchanges sodium ions for the magnesium and calcium ions in the water, thus reducing KH & pH and to some extent, GH. However, according to this link
http://faq.thekrib.com/begin-chem.html
"Typical home water softeners soften water using a technique known as ``ion exchange''. That is, they remove calcium and magnesium ions by replacing them with sodium ions. Although this does technically make water softer, most fish won't notice the difference. That is, fish that prefer soft water don't like sodium either, and for them such water softeners don't help at all. Thus, home water softeners are not an appropriate way to soften water for aquarium use."
So although the GH may be lower when we test with our test kits, there's actually the same amount of ions in the water as before. This means that we should just use softwater as a form of pH control and note that it'll throw our GH test kits off. It's supposed to work really fast though, so pros and cons.
Peat works by releasing acids and probably taking some calcium ions out of the water, so the pH, KH and GH all falls. Kinda different from ion exchange.
Similar to Borneowild humic and Benibachi Fulvic grains I guess.
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