4 PACK Pentair Clean & Clear 420 R173576 178584 ALL AMERICAN Replacement Cartridge, Unicel C-7471, Pleatco PCC105, Filbur FC-1977, Swimming Pool Filter Cartridges
All American Cartridges have the industry's only Anti-Microbial "Open Flow Core" that helps prevent algae and bacterial growth, retains structural strength, yet water will easily flow through the filter core.  The amplified flow can increase particle removal, generate faster turnover of the water in a pool or spa, and lower overall energy usage, compared against competing products. These cores are the leader in strength and optimal flow.  The Premium Grade Media is Polyester Point Bonded media which contains more fibers per square foot than any other media, providing greater dirt holding capacity so your pool gets cleaner faster.  Because of  the uniform weave, dirt loads up evenly using more square footage of the cartridge. The water passes through the media easily, using less pressure for a more energy efficient cartridge.  The media has a slick feel because the fibers are on the inside to capture the dirt particles there, making the cartridges easily cleaned.  When the cartridges are cleaned the fibers on the inside release the dirt and you don't have to work as hard to clean the cartridges.  The fibers don't get fuzzy over time extending the usable life of your cartridge. The point bonds add strength to the media, allowing it to hold up to the chemicals in your pool.  The Banded and Sharp Pleats maximize flow during operation, helping to reduce the frequency of cleaning and stabilizing the pleats.   The sharp pleating makes the cartridges easier to clean.  A proprietary Anti-Microbial resin end-cap keeps the filter's rigid structure intact, and provides a knife edge seal, which prevents the growth of bacteria and related pathogens.  Our Pledge "Guaranteed excellence in performance, reliability, durability and satisfaction."MADE IN THE USA!