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'Photo catalysis L' is a portable water purifier that takes advantage of the photo catalytic water treatment technology.It contains a top cover, titanium dioxide catalyst net, active carbon & nano filtering net, toughened glass bottle body, an ultraviolet lamp base,and a washer. During the day, it can directly use sunlight photo catalytic reaction to the purify water,while heavy metals will be adsorbed by the filtering net .At night, you can open the opening of the bottom to make the the ultraviolet lamp work .