This paper outlines simple home made Activated Carbon-UV home water purifier system to remove taste, odour, synthetic organic chemicals (SOCs), pesticides, herbicides and detergents from drinking water and disinfect by UV radiation at the consumer end.

Arsenic in groundwater beyond allowable concentration of 0.05 mg/lit in some parts of India, has posed serious threat to well being of large section of people. As one of the major mitigation, the contaminant is being removed from extracted groundwater and then the water is pressed for essential use of the people. There are several methods being employed for removal of arsenic in it's pentavalent as well as trivalent forms. The sludge generated from co-precipitated flocs or backwater water from absorbed/adsorbed/Ion exchangers etc.

In 1999, the Israeli government initiated a long-term, large scale SWRO (Sea Water Reverse Osmosis) desalination program. The program is designed to provide to the growing demands on Israel's scarce water resources, and to mitigate the drought conditions that have characterized most years since the mid 1990s.

Untreated waste water is a health hazard. Nonetheless, it should be considered a resource. Unless it is recycled and re-used, it will be impossible to provide all people in the cities of developing countries with safe drinking water. The example of India shows that agglomerations cannot get ever more fresh water from ever farther away.

Aquatic vegetation is generally considered as nuisance plant communities which cause hindrance to aquaculture practice, resulting in the loss of aquaculture yields. Despite all these disadvantages, the importance of freshwater vegetation and their resources to human welfare can not be neglected rather invites attention too.