This is a Pentair Rainbow #1300 Specialty Test Kit for Total Alkalinity using a drop test and visual method. Testing parameter indicates total alkalinity in PPM. The reagents in this kit are 1/2 and 1 ounce. This kit comes in a compact box with instructions.
The total alkalinity is a measure of how much of the alkaline substances there are in the water. In the swimming pool water, there is a concern with bicarbonate alkalinity which should be between 80 and 120 ppm. Lowering the total alkalinity is a slow process.