The Penn Plax Cascade 700/1000 GPH Canister Filter Aquarium Bio Sponge keeps the water in your aquarium clean and clear. This Cascade filter sponge removes ammonia and nitrites from the water keeping your fish tank healthy, clean, and odor free. This bio sponge also optimizes the colonization of beneficial aerobic bacteria which prevents cloudy water and excess CO2 which can harm. Made specifically to fit the Cascade 700 / Cascade 1000 Standard and Elite Canister Aquarium Canister Filters, this replacement bio sponge fits securely without gaps that lead to weaknesses in filtration strength. An exact fit keeps debris and contaminants from getting through your filtration system and back into water. Made of a durable poly-fiber, this bio sponge filter is made to last for several months under normal conditions.  When used together, the Cascade 700 Filter Model CCF2UL / Cascade 1000 Filter Model CCF3UL and filter cartridges provide maximum protection against water pollutants from harming your fish.

• Keep your water clean and clear with the replacement bio sponge for use in the Cascade 700 Model CCF2UL and Cascade 1000 Model CCF3UL canister filters.
• The bio sponge filter removes ammonia and nitrites from your aquarium tank keeping your aquarium clean, healthy, and odor free.
• 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 700 / 1000 filter tray without any gaps  which could allow pollutants to re-enter the water.
• Genuine Penn Plax replacement cartridge for Cascade 700 / 1000 standard and Elite models. When used together, the filter and bio sponge provide maximum protection against water pollutants.