Item Type: Aquarium Sponge Air Driven Filter_x000D_ Material: Plastic, Filter Cotton, Filter Stone_x000D_ Use: Fish Tank Filtration 1MULTI LAYER FILTRATION: Aquarium sponge air driven filter is designed with multiple layers of different filters, safe and non toxic, no harm to fish tank water quality. 2CONVENIENT TO USE: Aquarium sponge filter can be placed directly into the fish tank, simply connect it to the air pump (not included). 3PHYSICAL AND BIOCHEMICAL FILTRATION: Fish tank air driven filter combines physical and biochemical filtration for fish with increased oxygen solubility. 4GOOD FILTRATION EFFECT: Aquarium sponge air driven filter has stronger filtration effect and multi?layer filtration to ensure clearer fish tank water. 5PREMIUM MATERIALS: Fish tank air driven filter uses plastic, filtering cotton and filtering stone filtration to effectively filter fish tanks.1 x_x000D_ _x000D_ AquariumSpongeAirDrivenFilter