Water purifier is known to all with the first level is the PP filter, also called melt-blown PP, material is polypropylene (PP), main effect is filtered tap water is greater than 1 micron in diameter of various harmful impurities, organic pollution minerals sundry etc. Because there is no drainage function, its service life is generally 3-6 months, so be replaced periodically filter, otherwise it will cause the secondary pollution, water quality can not be guaranteed. According to the scope of use can be divided into 10 inches to 40 inches, according to special requirements, density, length and weight to be customized. According to the difference of aperture, PP can be divided into 1um and 5um, and then the weight is about 100g and 110g. The aperture cannot be recognized by the naked eye, but the weight and tactile sensation can be distinguished by hand. The quality of the filter element directly affects the quality and filtration effect of the water purifier, so the commonly used 1 micron and 5 microns, the heavy one is the best choice. At the same time, because PP cotton filter element is generally used in the first three levels, it must be replaced regularly, otherwise it will affect the service life of RO membrane and the TDS value of effluent water quality.
　　Is the PP cotton filter core hard or soft? Actually denser holding up strong, also means that compressibility is high also, filtration precision and service life is longer, the PP and soft in large water pressure or use time may be scattered, after falling filter degree, affect the normal operation of RO machine, and so to both quality and price are the dominant PP can fundamentally improve the quality of the whole water purifier.
　　This paper is sorted out by dongguan oneness filtration technology co., LTD