Had to look it up on the MT Gravatt Pet City site.. then look up the salts used, and from what I gather, no.. it's not the same. What you have is for fish that like salt, or to start up a tank.. something like that. The deioniser I believe is to make the tap water safe.. sort of like reverse osmosis? But I can be wrong.. didn't delve that deep into it once I knew it wasn't the same.
BUT! I did find some AQ salt that they sell there.. API AQ salt
IMO it's pricey, but it lasts forever and it's good to have around..