The listing is for two filters.   Gradient Density Sediment CartridgeGrooved Cartridges with Large Surface AreaIncreased Dirt Holding Capacity1 Micron Filtration Normal 0 false false false EN-US ZH-CN AR-SA 1 Micron Removal of Dirt, Rust & Sediment BB/Full Flow Size 20" × 4.5" Sediment Cartridge Grooved Cartridges have increased surface area for longer life and better performance.   Features and BenefitsGradient 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 compatibilityContains no binders, agents, solvents, antistatic materials or wetting agentsMeets FDA requirements for food and beverage contactNo leachables or extractables to contaminateNo surface binders to reduce flow and increase change-out frequencyAvailable in wide range of lengths and micron ratingsCartridges are individually shrink wrappedApplicationsWhole House Sediment FiltrationReverse Osmosis PrefiltrationFood and beveragesOil and gasFine chemicalsElectronicsMetal finishingPulp and paper