(11) Hold the comparator (3) with the eyepiece (9) about 10 inches from the eye facing a good light source,
preferably daylight, but avoid direct sunlight. Rotate the color disc until the color on the disc matches the
color of the test solution. Read the results.
Determine chlorine dosage requirement by subtracting ppm of source water chlorine residual from the
desired chlorine residual (as prescribed by TB-MED-577). For example
Desired Chlorine Residual
Source Water Chlorine Residual
Chlorine Dosage Requirement
If the chlorine dosage requirement is 2 ppm, for example, find a dosage ppm of 2 in Table 2-3. If the dosage
requirement is 2 ppm, 17.5 ounces of calcium hypochlorite will be mixed with 5 gallons of water.
Fill mixing bucket half full with water using reservoir fill hose (9, Figure 2-6).
Table 2-3. Calcium Hypochlorite Dosage Table
Hypochlorite is caustic and can cause severe chemical burns. To avoid injury:
Death or severe injury can occur from ingestion of hypochlorite solution. Do not swallow solution. Do not
breathe fumes from solution or dust from hypochlorite powder.
Use only clean, dry utensils when handling solution. Do not add solution to any dispensing device containing
residue or another substance. Death or severe injury can occur from explosion, fire, or chlorine gas caused by
contamination of hypochlorite solution with moisture, organic matter, or other chemicals.
Wear required protective clothing any time you are handling calcium hypochlorite.
If hypochlorite solution comes in contact with skin or eyes, flush immediately with large amounts of water, and
seek medical attention.
If hypochlorite solution spills on equipment, rinse with large amounts of water.
Add calcium hypochlorite to mixing bucket (7) and mix thoroughly with paddle (6) until dissolved.
Add water to mixing bucket until full while continuing to mix with paddle (6).
Pour 1/2 of the solution from mixing bucket into hypochlorination unit reservoir, and set bucket with remainder