We'll consider a couple of examples to help you use the table above. In the first example, our phenolphthalein test showed no alkalinity (P=0) and the total alkalinity is 80 ppm as CaCO3 (T=80.) As we can see from the table, when phenolphthalein alkalinity is 0, all alkalinity is bicarbonate. As a result, our water contains 80 ppm bicarbonate alkalinity and 0 ppm hydroxide and carbonate alkalinity
Let's assume that P=50 ppm and T=80 ppm. In this case, 2P is more than T, so we read the fourth row of the table. We can calculate the components of the alkalinity as follows: