The Living World Dynaflo No. 2 Filter Cartridge is an advanced, triple-layer, bonded, multi-phase cartridge that ensures the cleanest possible water output. It is designed for quick filter media changes with no mess. The duo-density polyester pad layer captures debris and prevents clogging. The carbon-impregnated pad removes contaminants quickly, while a granular base carbon extends filter life. The cartridge also provides an excellent home for beneficial bacterial populations. It comes in a convenient disposable 3-pack format and is packed in a foil bag to seal in freshness.