A pitcher-type water purifier that provides delicious water with its unique filter technology. - Type: Pitcher-type water purifier - Filter: Proprietary hollow fiber membrane filter - Substances removed: Removes bacteria and red rust of 0.1μm or larger - Cost performance: One filter cartridge can be used for the equivalent of 100 2L plastic bottles of water Used for about half a year. There are water stains from washing (6th image). This is a used item, so please only purchase if you understand this. Immediate purchase is welcome.