The ET-Pure from Triwin Watertec Co. Ltd., of Taichung, Taiwan, is a device that’s very compact. The bottle can be separated from the device easily using a patented “cap style” design. It will automatically stop generating pure water when the bottle is full. One device can generate up to 20 bottles of drinking water per day. The volume of the bottle is 2.5 gallons, which is suitable to carry for outdoor use. The “big cap” design of the bottle allows the user to clean the tank quickly and easily.