The chulli system is an innovative technology for household treatment of microbiologically contaminated
water. A metal coil is built into a traditional clay oven, and during cooking events water is passed
through the coil, raising the effluent temperature to at least 60° C and effectively pasteurizing the water.
The capital costs are low, and no additional time or fuel is required to treat the water. Although first
developed for use in arsenicaffected
areas of Bangladesh, it is now finding wider application in coastal
areas affected by cyclone Sidr, where surface water is the main source of drinking water