Group one is clean h2o, Group two is grey drinking water, and Category three is blackwater. Clean drinking water refers to a source that doesn't lead to considerable damage to humans, whilst gray water may comprise some contaminants that may cause sickness or discomfort. Blackwater is highly contaminated with microbes https://marco4vdls.designi1.com/52639155/what-does-how-to-clean-sewage-in-unaizah-mean