Errr... don't miss up the units. 4% of the solution is K, that means in very simple terms, in 1ml of the solution, you get 4% x 1 ml = 0.04ml of K. ml is volume, mg is weight. The weight of any volume of a substance depends on its density. So 1ml of K does not necessary equate 1mg of K. Get what I mean?
So, according to the dosage, you can assume that 1ml of Flourish K contains 40mg of K.
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