Changes

[[Image:PUR sachet.jpg|thumb|right|200px|PUR sachet]]

[[Image:treatedPUR.jpg|thumb|right|200px|Untreated water compared to water treated with PUR]]

The Procter & Gamble Company (P&G) developed PUR Purifier of Water™ in conjunction with the U.S. Centers for Disease Control and Prevention. PUR sachets are now centrally produced in Pakistan, and sold to NGOs worldwide at a cost of 3,5 US cents per sachet. The PUR product is a small sachet containing powdered ferric sulphate (a flocculant) and calcium hypochlorite (a disinfectant). PUR was designed to reverse-engineer a water treatment plant, incorporating the multiple barrier processes of removal of particles and disinfection.