Procedures :
1. Fill the mixing bottle to the 23-ml mark with the water that is to be tested.
2. Add the contest of one chloride 2 indicator power pillow. Swirl to mix.
3. Add the silver nitrate solution drop by drop to the water in the mixing bottle. Hold the dropper in a vertical position and swirl the bootle to mix after each drop is added. Count each drop as it is added until the water changes from yellow to red-brown in colour.
4. The chloride content of the water in mg/l chlorine (CL) is found by multiplying the number of drops that were added by 7.5
5. The reagent accuracy to be checked from time to time by using the reliable standard, such as the sodium chloride standard solution.
6. For cooling tower water, if chloride content less than 200 PPM, then the chemical CR-super and CR Z-2 are to be added.
For steam generator water, if chloride content less than 300 PPM, then the chemical CR-oxide and CR Z-1 are to be added.