To calculate the dose rate of a chemical required in a given volume of water
the formula is:
Dose rate = required ppm x volume of water to be treated ÷ (% of active
ingredient x 1,000,000)
Example:
To calculate the dose rate of 200 ppm of a chemical with an active
ingredient of 650 grams/Kg in 100 litres of water = 200 ppm x 100 litres ÷
(65% x 1,000,000)
Active ingredient of chemical is 650 grams/litre = 0.650 grams/milliliter
You need 200 parts per million (ppm) which translates to 200 milligrams per
litre (mg/L)
(1000 grams = 1 litre, 1000 milligrams = 1 gram, 1 million milligrams = 1
litre or 1 mg/L = 1 ppm)
100 litres at 200 mg/litre = 20000 mg or 200 grams
200 grams needed divided by 0.650 grams/mil of chemical = 300 milligrams per
100 litres of water
I HOPE that's right - anyone else done the calculations????
Adrian.
Adrian R. Tappin
Brisbane, Australia.
"Home of the Rainbowfish"
http://www.ecn.net.au/~atappin/home.htm