I told my mom I would need distilled or RO water to make the water in my new aquarium softer, as we have very hard tap water. But she said she could get softener salt to put in our water tank or something like that, and use that water instead. I'm pretty sure that'd be deadly to any fish... but she insists that it's the same thing.
I've read Byron's guides on water hardness and PH, and after researching distilled and RO water, the big difference I'm sure is that the softener salt water would be very impure as opposed to using distilled or RO.
But yea, is my mom right that we could use that water... or should I tell her she's trying to kill my fish? lol