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cloth filter
Developed for use in Bangladesh, the cloth filter is a simple and cost-effective appropriate technology method for reducing the contamination of drinking water. Water collected in this way has a greatly reduced pathogen count - though it will not necessarily be perfectly safe, it is an improvement for poor people with limited options.
==Method==
The method used in Bangladesh is as follows: an old sari is folded to make four or eight layers. The folded cloth is placed over a wide-mouthed container used to collect surface water.
It is usually sufficient to rinse the cloth and dry it in the sun for a couple of hours. In the monsoon seasons, it may be advisable to use a cheap disinfectant to decontaminate the material.
The preferred cloth is used cotton sari cloth. Other types of clean, used cloth can be used with some effect, though the effectiveness will vary significantly. Used cloth is more effective than new cloth, as the repeated washing reduces the space between the fibres.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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