Chulli Water Purifier

Using waste heat from cooking in Bangladesh

Much of Bangladesh suffers from frequent flooding, coastal storm surges and devastating tropical cyclones. When disaster strikes, trying to access clean water is a huge problem for thousands of families. In rural areas the most common source of water is from open ponds. Large numbers of people do not have access to sand filters and often take water for drinking directly from these open ponds and as a result suffer a heavy burden of illness or death from diarrhoeal diseases.

Case-study-embeddedWorking with a local NGO, Integrated Approach for Community Development (IACD), Oxfam, supported the development of a water filtration system, the ‘Chulli’ Water Purifier, for individual households, which can purify water in a reliable and costeffective way. The filter works by passing water through a modified household stove to heat it, and when used correctly by families has been proven to kill the micro-organisms such as E.coli that cause diarrhoeal disease.

After a field evaluation of the initial design in 2014, improvements and modifications were made to the filter to improve efficiency and prevent mechanical problems. Twenty thousand improved Chulli Water Purifiers were installed in two regions of southern Bangladesh affected by flooding to ensure that safe drinking water was available at the household level, without the need to use chemicals. Programmes in Nepal and Myanmar have since replicated the use of similar low-cost filters for their own needs.

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