This listing is for 6 filters. This is a clearance listing. The filters have been on the shelf for some time and might have one or two brown spots. But the brown spots might be on the plastic wrap. It is hard to tell. Gradient Density Sediment Cartridge Grooved Cartridges with Large Surface Area Increased Dirt Holding Capacity 1 Micron Filtration Features and 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 Available in wide range of lengths and micron ratings Cartridges are individually shrink wrapped Applications Whole House Sediment Filtration Reverse Osmosis Prefiltration Food and beverages Oil and gas Fine chemicals Electronics Metal finishing Pulp and paper