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Do the front filter and pp cotton need to be used together? At present, the ultra-filtration water purifier on the market is basically Grade 4, pp cotton-front activated carbon-ultra-filtration membrane-rear activated carbon. Generally speaking, the first two grades are pre-treated. First, the particles with larger diameter are filtered out, and then further processed to the UF Membrane. Finally, the rear activated carbon is used to improve the taste. The 4-stage filtration can extend the life of the water purifier very well. regardless of the water quality, it is recommended to add a pre-filter before the UF membrane.