AF Component 1+2+3+ is designed to fulfil coral demands not only in terms of Magnesium and Calcium, but also in terms of other elements which require careful and systematic dosing, but are notoriously difficult to assess.
"The formula has been fine tuned in Aquaforests lab and enriched with trace elements that are fundamental for maintaining marine aquarium organisms in good form. As a result we have composed 3 fluids that are intended for dosing in equal amounts on regular basis ."
Component 2+ contains:  NaHCO3, F, I. (25 ml dissolved in 100 l/27 US gal raises KH by 0,65 dKH (Alk: 0,23 meq/l)).
Dosage :
Needs to be adjusted according to the consumption of macro-nutrients, and based on critical water parameters like Calcium, Magnesium and KH.
If one or two parameters are still not balanced, we recommend to continue with administering equal doses of each component and take advantage of Aquaforest additives (Calcium, Magnesium, KH Buffer) to restore desired level(s).
  In order to maintain adequate amount of trace elements in aquarium water, both Magnesium and Calcium levels need to be within recommended range (Ca 380-460 ppm, Mg 1180-1460 ppm).
Typical aquarium with average number of hard corals requires approximately 25ml of each component per 100 l (27 US gal) of water daily. 
In order to keep the parameters stable, we advise to  split the daily dose into as many small doses using a dosing pump