H2O-(H2O-US4-I) Inline Deluxe 5 Stage Under Sink FilterH2O International Under Sink Filtration H2O US4 I Inline Deluxe 5 Stage Under Sink Filter High capacity inline filtration that lasts up to 5 years with KDF and GAC media for comprehensive contaminant reduction 5 Year Filter Life KDF GAC System Complete Kit WHY IT WORKS Long life inline filtration with KDF and activated carbon KDF Media Processing Kinetic Degradation Fluxion media reduces heavy metals like lead, chlorine, and prevents bacterial growth