That's a sewage treatment plant treatment process. We don't typically drink treated wastewater, but some places recycle the water after a intensive purification

That's a sewage treatment plant treatment process. We don't typically drink treated wastewater, but some places recycle the water after a intensive purification process. Chlorine in drinking water treatment is used for disinfection and a small amount is added after treatment to keep bacteria from growing in the distribution system. Your information is not really relevant but interesting.