NTU = 1.47 * (mg / L)
dollar = [money] = USD
lempira = dollar * 0.0427 = HNL
equivalent = mole = eq
rev = revolution
MGD = 1000000 * (gallon / day)
british_thermal_unit = 1055.056 * joule = Btu = BTU
flux_lmh = liter ** 2 / (hour * meter ** 2) = LMH
permeability = LMH / bar