Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. BioSand Water Filters are a technological adaptation of the centuries old slow sand filtration process. While implementations exist in many different sizes and varieties, the most common design is intended for use in rural homes where naturally safe or treated water sources are not available.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.