Randy Holmes Farely recipe's Canadian version

[Hightower]

Ok Im sure many of you have read or are aware of Randy's recipes for 2 part alkalinity and calcium adding which is supposed to be a cost alternative to the expensive commercial stuff.

First of all does anyone use it, and 2nd, Where do you get your Epsom salts, and Dow flake. Baking soda is a no brainer sold as Arm and Hammer here as well.

Is this recipe good enough to substitute for my kalkwasser? I drip kalk with my RO top off.