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Filter cap with a special material, can be convenient and economic mass production, is designed to dry areas such as outdoor emergency use in Africa, you just need to connect two bottle cap which meet the international standards of ordinary beverage when using, The sewage in the upper bottle can seep into the empty bottlein the lower part through the filtration layer to complete simple water treatment bringing convenient and sanitary drinking water to people in the arid areas and improving the quality of life..