Alkalinity is a measure of the capacity of water to neutralize acids. Alkaline compounds in the water such as bicarbonates (baking soda is one type), carbonates, and hydroxides remove H+ ions and lower the acidity of the water (which means increased pH).
Fill the vial to the 20 ml line
Add 5 drops of KW11 and swirl to mix.
Add KW-12 one drop at a time mixing between each drop.
Count the number of drops required fro teh sample to change from blue to yelloe/orange.
Alkalinity as CaCO3 = Drops KW-12 used x 10
For expected levels above 250 ppm use 10 ml water sample and 3 drops of KW-11. Alkalinity as CaCO3 = Drops KW-12 used x 20