
The tester is used to measure free (active) chlorine and the pH level of pool water. To keep your pool water crystal clear, using it is essential. First, measure the pool water values and, if they are not within the recommended range (pH 6.9-7.4; Cl 0.3 - 0.7), adjust the pool water using pool chemicals. First adjust the pH value (pH+ or pH-), then adjust the chlorine level (only increase it - if the chlorine level is too high, do not reduce it; it will drop on its own after a few days). Chlorine should be added only after the pH has been regulated, because the effectiveness of chlorine outside the recommended pH range drops rapidly.
The drop tester works on the principle of visual comparison with a color chart next to the sample chambers - after adding the drops (chlorine / pH), the water changes color, and based on the results, the chlorine / pH level in the pool needs to be adjusted.