Some small treatment plants in Africa produce their own sodium hypochlorite on site from the electrolysis of brine. Power demands range from 1.7 to 4 kwh per lb. of NaOCL. 2 to 3.5 lbs. of salt are needed for each pound of NaOCL.
These units are fairly simple and are made in both the U.S. and the U.K.
Another system, [....]
CHLORINE DISINFECTION
Chlorine deactivates microorganisms through several mechanisms that can destroy most biological contaminants, including: 
- Damaging the cell wall
- Altering the permeability of the cell (the ability to pass water in and out through the cell wall) • Altering the cell protoplasm
- Inhibiting the enzyme activity of the cell so it is unable to use its food to produce energy
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