Penn-Plax Cascade 1200/1500 GPH Canister Filter Aquarium Bio Sponge Replacement; 1 Pack, black

• Filter sponge optimizes the colonization of beneficial aerobic bacteria which prevents the water from becoming cloudy and harming fish.
• Perfectly cut to fit into the Cascade 1200 / Cascade 1500 filter tray without any gaps ?which could allow pollutants to re-enter the water.
• International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

Product Description Convenient, no-fuss replacement sponge for your Cascade canister filter. ;Optimizes the colonization of beneficial aerobic bacteria. ;Removes ammonia & nitrites keeping your aquarium healthy. Directions Inside Box