Aquaforest has a similar product to balling part c that accomplishes the same thing.Just to clarify, the only true Balling Method solutions available anywhere in the world are manucfactured by Tropic Marin. That amnufacture is ovetseen by our Head of Product Developement, Hans-Werner Balling. There are no other solutions, that I am aware of, that are the exact formulas of the original Balling Method made by any other company. Even products labeled as "Balling something" are not actually Hans-Werner's formula.
This is not to say that there are not MANY other great calcium/alkalinity products out in the Market. Just that they are NOT Balling, even when labeled as such.
I’ll also note that one can use Aquaforest Mineral Salt in place of Balling Part C. I expect the amount needed is likely the same, but might vary a bit based on moisture levels in the two sodium chloride free salt mixes.