EQUIPMENT NEEDED: Field chlorination kit containing chlorine ampules, color
comparator, and chlorine test tablets.
Check the chlorine residual when—
- Filling unit containers at water distribution points.
Water containers arrive in unit area.
Directed by command medical authority.
Treating a raw water supply.
STEPS OF PERFORMANCE:
STEP 1: Determine the desired chlorine residual in milligrams per liter (mg/L).
- At the point of consumption, water obtained from an approved water
distribution point should have at least a trace of chlorine residual.
- When the unit must obtain water from a raw water supply, or from another
source such as a stream or pond, the finished product should have a 5-mg/L
chlorine residual after 30 minutes. Under certain conditions, the local medical
authority may direct a higher residual.
STEP 2: Flush the spigots of the water container being checked and fill the color
comparator tube to a point just below the top of the tube.
STEP 3: Place one chlorine test tablet in the comparator and allow it to dissolve.
STEP 4: Hold the color comparator at eye level and toward a good light source.
STEP 5: Compare the color of the water with the color disc on the opposite side of
the color comparator.
- The water is safe to use if the color of the water is the same shade or darker
than the required color for the chlorine residual.
- The water must be chlorinated if the color is lighter than the required residual.
|
