Even the calcium and alk parts (in the liquid form they sell) are not designed for 1:1 dosing. I think BRS incorrectly claims they are.
https://www.redseafish.com/reef-care-program/reef_foundation_program/reef-foundation-b/
Concentration:
Liquid supplement: 1ml will raise the Alk level of 100 liters (25 gal) by 0.036 meq/l (0.1dKH)
https://www.redseafish.com/reef-care-program/reef_foundation_program/reef-foundation-a/
Concentration:
Liquid supplement: 1ml will raise the Ca level of 100 liters (25 gal) by 2ppm.
2 ppm calcium is not correctly balanced 1:1 by 0.036 meq/L.
A correct balance is closer to:
2 ppm calcium is correctly balanced 1:1 by 0.1-0.11 meq/L (exact values depends on extent of magnesium incorporation)
The magnesium part is not close to 1:1 dosing with the other parts. It's more like 1/5 to 1/10 of the calcium part
https://www.redseafish.com/reef-care-program/reef_foundation_program/reef-foundation-c/
Concentration:
Liquid supplement: 1ml will raise the Mg level of 100 liters (25 gal) by 1ppm.