I bought the BRS two part system that comes with their two dosing pumps. I feel this was "one" of the best purchases I made. Just make sure you follow the directions when setting the pumps up. I found one of my pumps dosed a bit more than stated so I had to adjust the run time of the pump, which was simple through my Apex.
Oh and get a couple extra 1 gallon jugs, either buy them or use something like empty vinegar jugs so you can have one set that the tank is taking from and the other jugs mixed and can be settling.