Britas multistage filter reduces impurities and has an added layer to trap sediment so all thats left behind is healthier great-tasting water. Two-pack of the most effective Brita filterEliminates bad tastes and odors by reducing chlorine and hydrogen sulfideShould be replaced every 100 gallons or every four months whichever comes firstBuilt-in findicator flashes red when you need new filterMay help avoid certain health risks and some parasitic illnessesThe Brita On Tap Faucet Filterhas been tested and certified in Model FF-100 by NSF International the nations leading testing authority for water filtration products forANSINSF Standard No. 53 Health Effects - Reduction ofLeadCysts Cryptosporidium and GiardiaAsbestosTurbidity0-DichlorobenzeneAlachlorAtrazineCarbofuran2 4-DChlordaneHeptachlor epoxideLindaneMethoxychlorTrichloroethylenStyreneToxapheneChlorobenzeneBenzeneEndrineCarbon TetrachlorideSimazineTolueneTetrachloroethyleneEthylbenzeneANSINSF Standand No. 42 - Aesthetic Effects - Reduction ofChlorineTaste and OdorParticulate Class IKeeps a healthy level of fluoride a water additive that promotes strong teeth applies to fluoridated municipal tap waterFilter replacement is essential for product to perform as represented. Filter lasts for 100 gallons 378 liters or 4 months whichever comes first. Filter life may vary depending on local water conditions.06/01/2010headerFilter Cartridge 30 Days