Red Sea has a nice calculator that suggests parameters based on the population of your tank. Of course it is tied to their products, but Parts A, B and C are typically Calcium Chloride, Soda Ash (Alkalinity) and Magnesium Sulfate. Some vendors add trace elements in addition to the Magnesium in part C. For a new tank as long as your are doing regular water changes with a reputable salt mix, you probably don't need to dose trace elements. You will need to add this in as your corals grow out and mature.
I'm not familiar with Aqua Forest's pricing, but if you are sticking with the Balling Method (which is ABC above), Bulk Reef Supply has the basic ingredients prepackage for self mixing with RO/DI water. BRS also has calculators on their site to tell you how much of each solution to add based upon your currently tested parameters. You can purchase the ingredients elsewhere for a little cheaper, but BRS is simple enough and cheap enough for me.
I would agree with the guys above on the Kalk reactor, but it does require some investment in equipment which will mix it and dose it slowly throughout the day. It can be done manually, but you need to be careful to not add too much at a time.
FYI, I've been in and out of this hobby since Bulk Reef Supply was actually that, a supplier of parts A, B and C rather than the Private Equity backed juggernaut they have become.