If you buy a Hayward / Goldline salt unit, follow the directions here, and add borates to the water . . . you WILL have a "Mineral Springs" system at about 1/3 the cost.

Hayward puts labels on the Mineral Springs hardware for Bioguard. The chemicals used are just pre-blended (so if you have too much of one, you're stuck) and over-priced salt + borax + acid + stabilizer, in different packages and ratios.