The function of the water purifier is to remove floating matter, heavy metals, bacteria, viruses, residual chlorine, sediment, rust, microorganisms, etc. in the filtered water. It has high-precision filtration technology, and the household water purifier is a five-level net. Water filtration technology or six-stage water purifier filtration technology, the stage of the five-stage filtration technology is the filter element, also known as PP cotton filter element (PPF), the second stage granular activated carbon (UDF) filter element, and the third stage is precision compressed activated carbon ( CTO) filter element, the fourth stage is reverse osmosis membrane or ultrafiltration membrane, and the fifth stage is post-activated activated carbon (small T33). The sixth-stage water purifier filtration technology finally added a first-stage filtration technology to a weakly alkaline energy rod (PPF filter + granular activated carbon + sintered activated carbon + ultrafiltration membrane + post-activated carbon + weakly alkaline energy rod). The water purifier is not only suitable for areas where tap water pollution is serious, but also filters residual chlorine in conventional tap water, and can improve the taste of water.