The strongest reinforced highest flow PVC center cores for even distribution of stress and increased debris loading. High-quality DirtMaster media ensures durability, cleanability, and efficient filtration performance. Antimicrobial end caps – reinforced for added strength and treated to repel odor-causing bacteria and mold. Plus, their advanced formulation resists deterioration from salt pools and high levels of chlorine DirtMaster support bands are wider, for greater break-resistance and optimum flow. Antimicrobial protection – when microorganisms come in contact with the treated blue filter media, they are no longer able to function, grow, or reproduce.