Figure 2-2. Original chlorination kit.
b. Use of the Chlorination Kit.
(1) Chlorinate the water. To chlorinate water, first remove the contents of
calcium hypochlorite from a glass ampule by gently taping the powder to one end.
(Hold the ampule between the thumb and forefinger of both hands, with the full end
down, away from the face and in a safe direction.) Then exert pressure with both
thumbs on the center of the ampule. The ampule will snap neatly into two pieces. This
content is poured into the mixing container in which the water is to be disinfected.
Normally, the chlorine demand (amount of disinfectant necessary to destroy organisms)
is satisfied after 10 minutes, but not always. Although the chlorine residual is sufficient
after 10 minutes, it is possible that microorganisms will continue to create a chlorine
demand. That is why it is important to wait another 20 minutes (total of 30 minutes) and
measure the chlorine residual. If the chlorine residual is less than 5 ppm (or as
established by competent medical authority), additional chlorine must be added and the
above procedures repeated.
(2) Measure for chlorine residual. The chlorine residual of water is
determined by use of the plastic comparator tubes and the orthotolidine tablets. The
procedure is as follows:
(a) Select the appropriate tube from the kit. The proper tube is the one
on which is printed the number of ppm chlorine residual required within the command.
(b) Fill the plastic tube to a point just below the yellow band with a
sample of the water to be tested.