Penn Plax Cascade 400 GPH Internal Filter Aquarium Bio Sponge Replacement 1 Pack

The Penn Plax Cascade 400 GPH Internal Filter Bio Sponge keeps the water in your aquarium clean and clear. This Cascade filter 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 400 Internal Filter; 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 400 Internal Filter Model CIF2 and Cascade 400 filter cartridges provide maximum protection against water pollutants from harming your fish.