... 1: 5micron PPF Cartridge which fliter sand,mud,rust,sediment,etc in water.Stage 2:Granular Activated Carbon Cartridge which ... removes bad smell and fliter organic sediment, chlorine etc in water.Stage 3:Block Activated Carbon ... the housings , take the filter cartridge out ,and remove the wrapping package and sticker , install cartridges with the direction indicated in ...