On the box it tells you either scoop or total weight, it makes a lot more sense to use the total weight than a scoop.
As per the instructions
Part A = 380 grams to 5L of RO
Part B = 420g to 5L of RO
Part C = 120g to 5L of RO
scoops are just a guide for those that dont have scales handy, it will never be as accurate as measured weight.
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