In 2005, drowning claimed the lives of 3,582 people. Although all age groups are represented, children four years old and younger have the highest death rate due to drowning, representing more than 25 percent.
The purpose of disinfection is to destroy harmful (pathogenic) organisms. The type and extent of disinfection used is determined by the source and condition of the water to be treated. Both CHLORINE RESIDUAL and CONTACT TIME are essential to effectively kill pathogenic microorganisms.