Freezing Technology

2.5.2.2. Marginal Chlorination

There are two important chlorination methods: marginal chlorination and super-chlorination with or without dechlorination. The latter includes break-point chlorination and in-plant chlorination.

Marginal chlorination is the addition of just sufficient chlorine to water to produce a residual level. The residual chlorine may be either free or combined depending on the amount of ammonia present in the water. This level of chlorination usually destroys pathogens.