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            Three-level classification
            Product name three
            Product Description

            A household water purifier is a drinking water device that performs advanced treatment on tap water. Household water purifiers began in the 1950s and became popular in the 1970s. Especially in the United States in the 20th century, the first discovery of disinfection by-products in tap water began. As a family self-protection device, many families began to install and use.

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