High Quality Activated Carbon Block Filter provides previously unattainable performance at the lowest price point. Manufactured from high purity acid-washed activated carbon. Its particulate holding capacity and the absence of carbon fines makes it the filter of choice. This carbon block filter simultaneously removes chlorine and organic chemicals that contribute to bad taste and odours while providing the particulate filtration and particulate holding capacity of an efficient 5 µm nominal sediment filter. Service life 2500 Gallons at 1.0GPM This filter will fit most 10" housing RO units.