Note The test tablets in all 3 color comparison tubes are the same. They can be used to test water in any of the tubes. Flush the spigots of the water container being checked and fill the tube to a point just below the bottom of the color band. Put the crushed tablet into the color comparison tube. The water is safe to use if the color of the water is the same shade or darker than the color band on the tube.
Chlorine residual is below required level.
Before adding chlorine, check the chlorine residual following procedures in Task 5 . If the chlorine residual is less than the desired level, add enough chlorine to raise the residual to 5 ppm. Use the table below to determine the amount to add to untreated water. If a 10 ppm chlorine residual is required, double these amounts. To increase the residual in treated water, smaller quantities of chlorine will be needed.