He sometimes uses bleaching powder or detergent (which proves to be harmful in some cases) for cleaning the tank. This process in the first place is very laborious and the cleaning is very ineffective as there is no guarantee that the person who scrubs the tank can physically remove the dirt from the tank.
Waterborne diseases are caused by pathogenic microorganism that most commonly are transmitted in contaminated fresh water. Infections commonly results during bathing, washing, drinking, & in the preparation of food .According to World Health Organization (WHO), such diseases cause about 1.8 million human deaths annually and 88 % of the burden is attributable to unsafe water supply, sanitation & hygiene. The common infections caused are viral, bacterial, and parasitic & protozoa infections caused when water is not treated well, many infections may be transmitted by microbes & parasites that accidentally have entered the water.