The CH1 30 ml liquid reagent is used to test Calcium Hardness with the ColorQ Pro 7 photometer and is a liquid alternative to calcium hardness tablets. Used with existing LaMotte pH comparators or colorimeters, CH1 drops are added to a 5 ml or 10 ml sample alongside CH2 to deliver accurate calcium hardness results. Liquid reagents are also available for Free Chlorine, Total Chlorine, pH, Hardness, Alkalinity and Copper testing.