This is the classic Brita faucet-mounted filtration system that installs in minutes and lets you switch between filtered and unfiltered water with the flip of a switch.The Brita OPFF-100 uses the same filtering mechanism as the newer FF-100 system but does not have an electronic filter change indicator. The OPFF-100 uses a mechanical meter to monitor the amount of water that has been dispensed from the system and slowly rotates an indicator from green to red which indicates that you should change your filter. The FF-100 uses an electronic LED to indicate when the filter should be changed and costs quite a bit more than the OPFF-100. Attaches easily in minutesNo tools requiredFits all standard faucetsIncludes 1 FilterQuick and easy filter replacementTested and certified by NSFinternational the nations leading testing authority for water filtration products againstNSFANSIStandard 53 - Health Effects - Reduction ofLead Cysts Cryptosporidium and Giardia Asbestos Turbidity o-Dichlorobenzene Alachlor Atrazine Carbofuran 2 4-D Chlordane Heptachlor epoxide Lindane Methoxychlor Trichloroethylene Styrene Toxaphene Chlorobenzene Benzene Endrin Carbon tetrachloride Simazine Toluene Tetrachloroethylene Ethylbenzene TTHM VOCNSFANSIStandard 42 - Aesthetic Effects - Reduction ofChlorine taste and odor Particulate Class I06/01/2010headerBRITA WATER FILTRATION PITCHER/DISPENSER: 90 Days