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Calculation for Medication
1 Part per Million (ppm) = 1 milligram per liter
(mg/L)
1 Part per Million (ppm) = 3.78 milligram per US
gallon (mg/gal)
1 Part per Million (ppm) = 4.55 milligram per UK
gallon (mg/gal)
>>For pure dry powder medications
In gallons
Dose in milligrams = gallons of
water x desired dosage in ppm (mg/L)
x 3.785 L/gallon
For Example - You want to calculate the amount of potassium
permanganate for a 3ppm long term bath in a 45 gallon tank.
Dose in milligrams = 45 gallons x 3ppm
(mg/L) x 3.785 L/gallon = 510.975mg
In liters
Dose in milligrams = liters of water
x desired dosage in ppm (mg/L)
For Example - You want to calculate the amount of potassium
permanganate for a 2ppm long term bath in a 200 liter tank.
Dose in milligrams = 200 liters x 2ppm
(mg/L) = 400 milligrams (mg)
>>For liquid medications not 100%
pure
In gallons
Dose in milliliters (ml) = gallons
of water x desired dosage in ppm (mg/L)
x 0.0038 x "purity factor" (100 / purity
in %)
For Example - You want to calculate the amount of a
20% potassium permanganate solution for a 3ppm long term bath
in a 45 gallon tank.
Dose in milliliters (ml) = 45 gallons x
3ppm (mg/L) x 0.0038 x 100/20
= 1.67 ml
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