FilterBalls 5-lb Thermally Bonded Polyester Pool Filter Aid in the Pool Cartridge Filters department at Lowes.com
FilterBalls Sanz Filtration Media | 5 Microns | 603658128142
Amazon.com: FilterBalls Blu™ - CleanTech Water Filter Media - Easy to Install Filter Media for Pools, Car Washes, Air Filtration, Agriculture - Replacement for Sand, Zeolite, and Mystic White - 1 Cubic