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I noticed a big difference in instructions on the back of the bottle for one of my Seachem fertilizers compared to what I was calculating with the Fertilator. I double-checked the calculation with Seachem's online calculator and it is showing something different from the Fertilator. Maybe there have been changes to the Seachem products since the Fertilator was last updated.

Fertilator Calculation for Seachem Flourish Nitrogen

75 gallons of water, starting at 0ppm, dose 5 mL of product, Fertilator calculates end result of 1.16 ppm

Seachem Website Calculation for Seachem Flourish Nitrogen

75 gallons of water, starting at 0ppm, desired mg/L (same as ppm) = 1.16, it calculates end result of product to be dosed is 21.8 mL

The amount of mL of product to be dosed should match, but they don't. I double-checked Seachem Phosphorus and the end result was a little off also, but not by as much.
 
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