A large capacity, 25 micron replacement cartridge uses a modified carbon block filtration system help reduce undesirable chlorine taste and odour (CTO) and sediments in your drinking water. A sediment cartridge made from an exclusive Progressive Porosity Process that entangles and entraps larger sediment particles toward the outer diameter and progressively smaller particles toward the cartridge core. This allows even loading for maximum cartridge life. In addition, the unique square-grooved surface provides more sediment-trapping surface area than ever before. Unlike string-wound and pleated paper cartridges, the rigid, sturdy construction of Aqua-Pure® Brand by 3M Cartridges are able to withstand variations in water pressure.