3M Cuno AP2-301 System (Head & Cartridge) c/w 1/4" Pushfit This filter reduces chlorine, taste, odour & sediment issues from your drinking water down to a 1 micron filtration rate. It also reduces benzene, dichlorobenzene & toxaphene. This filter requires changing for a new one every 3000 litres or every 6 months, whichever comes first.