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Conversion Factors

Volumes
1 UK Gallon = 4.54 litres
1 US Gallon = 3.8 litres
1 cubic foot = 28.4 litres
Weights
1 gram = 1000mg (milligram)
1mg (milligram) = 1000 ug (microgram)
1 mg is approx 1ppm (part per million)
1 ug is approx 1 ppb (part per billion)
Hardness
1 mg/ll CaCO3 = 0.1 F (degree french)
                           = 0.056 dH (degrees german)
                           = 0.0584 US grains per gallon
                           =0.0701 Clark
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