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Green-Tak Gravity Water Filtration is no power required, no waste of drain water, washable and long lifespan membrane, big flow rate, high filtration performance, and lower maintenance cost. The system is with patented gravity membrane, pore size is 10 to 30 nanometers, can block bacteria, such as Vibrio Cholera, to prevent from some diseases. The System is the best choice for rain water, river water, and other surface water to purify for domestic water use for washing and even for potable water.