100% impossible to determine, every tank needs are different. however this system is not about how little it will use but instead doing balling (or 3 part) correctly.
BRS adds none of the elements that are associated with real 3 part dosing and it also adds sodium chloride to the tank, furthermore inexpensive mineral mixes are inexpensive for a reason.
You just can not judge the two systems together. These systems at best do the bare minimum to your tank that balling (or true 3 part) should be doing, at worst creating ionic imbalances.
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