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1 µg / mcg = 0.00000022 gal Imp.
1 gal Imp. = 4,546,090.00 µg / mcg
Definition of micro-grams of water provided by SMARTe.org
Concentrations of chemicals in water are typically measured in units of the mass of chemical (milligrams, mg or micrograms, ug) per volume of water (liter, L, l).
Definition of U.K. gallon of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).