Product characteristics: · Filter cartridge for filter pump models: AR121 y AR118 · Suitable for above-ground pools · Filters and retains existing impurities in the pool · Aid to maintain water in good condition · High quality filtering material · Recommendable replace the filer every 2 weeks · Dimension: inside: Ø 3,8 cm; external: Ø 11,9 cm y high: 17,3 cm