The result of your conversion between microgram/liter and ounce/gallon [US] appears here
To convert between Microgram/liter and Ounce/gallon [US] you have to do the following:
First divide 1.0E-9/0.001 / (0.45359237/16)/0.0037854118 = 0.00000013
Then multiply the amount of Microgram/liter you want to convert to Ounce/gallon [US], use the chart below to guide you.
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