*TB 43-0153
APPENDIX B TABLES
Treatment Requirement
Chlorination Dosage and Time
Bromination Dosage and Time
Requirements
Requirements
Minimum residual required for
*0.2 ppm after 30 minutes in
*0.2 ppm after 30 minutes in
all potable water.
potable water tanks.
potable water tanks.
Water in potable water
**Trace readings throughout.
**Trace readings throughout.
distribution system.
Water from area where
2.0 ppm after 30 minutes in
2.0 ppm after 30 minutes in
amebiasis or hepatitis is
potable water tanks.
potable water tanks.
endemic or if an unapproved
water source is used.
Disinfecting tanks/potable water
100 ppm initially; 50 ppm after
Not applicable.
distributio n system.
4 hours (superchlorination).
Disinfecting hoses, couplings,
100 ppm for 2 minutes.
Not applicable.
and water connections prior to
connecting to potable water
system.
Scrubbing the interior of
100 ppm.
Not applicable.
contaminated potable water
tanks.
Emergency water supply for
5.0 ppm after 30 minutes.
Not applicable.
drinking and cooking.
*The amount of halogen compound added will produce an initial concentration of 1.0 ppm chlorine or
0.7 ppm bromine. These initial concentrations are necessary to obtain a minimum concentration of 0.2
ppm FAC or total bromine residual (TBR) after a 30 minute contact period in the potable water tanks.
The amount of chlorine/bromine required to produce a 30 minute FAC/TBR residual of 0.2 ppm can
vary because of halogen demand. Halogen demand is defined as the depletion of chlorine/bromine
through reactions with substances in water. In other words, the amount of halogen required to react
with these substances is called halogen demand. All water, including distilled water, has some halogen
demand. Additional bromine/chlorine may be used on treated water to achieve correct halogen
residual level.
**Trace readings are any detectable color changes on the DPD Test Kit's colorimeter.
B-4
