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.

Many of the systems intended to provide clean water for families in some of the world's poorest communities may not work. That's the conclusion of Paul Hunter, a microbiologist at the University of East Anglia in Norwich, UK, who has assessed past studies of the effectiveness of household water treatment (HWT) systems.

A primary limitation in applying Reverse Osmosis (RO) is loss of performance caused by membrane fouling resulting from compounds that bacteria can use as energy or nutrient sources. When these compounds enter RO membranes, they are capable of sustaining extensive bacterial growths on the membrane sheets as well as within feed channel spacers.