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After a flood, one of the most terrible natural disasters, it is often very difficult to find clean drinking water. SOURCE OF WATER is a water filter specially designed for refugees in flood-stricken areas to help them get clean drinking water quickly and conveniently. It is easy to use and based on a simple principle: water pressure, active water purification material and an ultra-filtration membrane are used to purify and decontaminate water automatically to produce clean drinking water. It is also readily portable and can be put into mass production at a low cost.