This listing is for two filters. Gradient Density Sediment Cartridge Each Cartridge Has 3 Layers Increased Dirt Holding Capacity 1 Micron Rating Features & Benefits: Gradient Density, Multi-Layered, Melt Blown Sediment Filter Cartridge. Larger particles are trapped in the outer layers, smaller particles penetrate deeper. Greater dirt holding ability and longer life than non-layered cartridges. Thermally bonded polypropylene micro fibers for purity and chemical compatibility Contains no binders, agents, solvents, antistatic materials or wetting agents Meets FDA requirements for food and beverage contact No leachables or extractables to contaminate No surface binders to reduce flow and increase change-out frequency Cartridges are individually shrink wrapped Micron rating is molded into cartridge Available in wide range of lengths and micron ratings Applications: Whole House Sediment Filtration Reverse Osmosis Prefiltration Food and beverages Oil and gas Fine chemicals Electronics Metal finishing Pulp and paper