Cascade™ 150 or 200 Filter Replacement Sponge - 1-Pack - Fits CPF3, CPF3F, CPF4, CPF4F Filters

The Penn Plax Cascade 150  GPH / 200 GPH Hang On Filter Bio Sponge keeps the water in your aquarium clean and clear. This Cascade filter sponge removes particles from the water keeping your fish tank healthy and clean. This bio sponge also optimizes the colonization of beneficial aerobic bacteria which prevents cloudy water. Made specifically to fit the Cascade 150 / Cascade 200 Hang On 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 150 Model CPF3 / Cascade 200 Model CPF4 Hang On Filter bio sponge provides maximum protection against water pollutants from harming your fish.