ONE Filtration (SCT-03CB) Enpress Cartridge Tank 3 Micron Carbon BlockEnpress ONE Filtration Series SCT 03CB Cartridge Tank 3 Micron Carbon Block High capacity cartridge tank that replaces inefficient 2. 5" or 4. 5" housings with commercial grade filtration in a single sealed unit 3 Micron Nominal 250,000 Gallon Capacity NSF 61 Certified Carbon 7 GPM Flow Rate The Enpress SCT 03CB is a sealed cartridge tank that eliminates the housing altogether, using coconut shell carbon block technology to reduce chlorine taste,