This is a genuine Unicel pool or spa filter cartridge made of high quality Reemay media, we carry genuine Unicel because of their high quality and high customer satisfaction. Please see our shipping chart for shipping costs on this filter. If you have questions on this filter or anything we sell please contact us. Unicel and virtually every brand name company in the filter business uses a spunbonded, 100% polyester material called Reemay as their filter medium. Reemay, which has FDA compliance, is approved for milk filtration and is white to indicate purity. The yellowish material (technically also a spunbonded polyester nonwoven) is less expensive. This is another reason why Unicel builds its replacement cartridges to OEM design specifications, and why Unicel is number one in quality and reliability.