The liquid solution test kit (20cc/ml) comes with two chemicals you must add to the water samples: OTO (orthotolidine), and phenol red. OTO measures the water’s chlorine level, while phenol red measures pH level.

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This solution is sodium thiosulfate, a chlorine neutralizer. Add five drops of Solution 2, a phenol red indicator, and mix by gently swirling. Compare the color with the pH color standards on the plastic tester to determine the pH level of your pool water

PH (acidic/basic) : 7.2 – 7.6
CL (Total & Free Chlorine) : 1 – 3 ppm

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