Yeah, I think if you pour five 2liter soda bottles full of tap water into a 5 gal bucket to get 10 liters and add 1 cc of your chlorine to the water and stir, you can then measure it as if it was in the pool....I THINK that's it. It's the same as adding 1 liter of bleach to 10,000 liters of pool water. Or adding 1 gallon to 10,000 gallons. It was an eyedropper measure or so. Whatever 1/10,000th of 10 liters is.