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Kentucky | I had to do the same to about 1500 gallons of 32%.
As I figured it, the tank with 400 gallons would need 476.5 total gallons (add 76.5 water).
The tank with 2200 gallons would need 2620.5 total gallons (add 420.5 water).
32% has 3.552 # of N per gallon (11.1 #/gallon product).
28% has 2.982 # of N per gallon (10.65 #/gallon product).
400 g -- 32% X 3.552 # N = 1420.8 # N
1420.8 # N / 2.982 # N = 476.5 g -- 28%
Follow the same process for the 2200 g = 2620.5 -- 28%
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