7 replacement cartridges included (size 6) for compatible pool and spa filters. Longer service life means fewer cartridge changes, saving time and money while keeping water hygiene. Dart removal technology Dirt locking design captures more impurities, deposits and particles from the water, improving overall water quality for a cleaner pool or spa. Safety and hygiene BPA-free and lead-free construction with anti-germ properties provides an extra layer of protection against bacteria and micro-organisms, supporting higher water hygiene. Easy to use and maintain Rinse the cartridges with a hose for quick cleaning. For best hygiene, clean every 2 weeks. Features a shatter-resistant end cap, high absorption, and chlorine resistance to ensure long service life and reliable performance. Use scenarios - Regular residential pool maintenance: keep water clean and clear with less frequent cartridge changes. - Spa or hot tub upkeep: effectively remove impurities to maintain comfortable, hygienic water. - High-use or seasonal pools: the 7-cartridge set supports longer intervals between replacements during peak periods.