Cascade 150 & 200 Bio-Sponge

Replacement Bio-Sponge for the Penn Plax Cascade CPF3 150 and CPF4 200 aquarium filters. Optimizes colonization of beneficial aerobic bacteria.

Removes ammonia and nitrites keeping the aquarium healthy. Convenient, no fuss replacement sponge slides into your existing frame. Each sponge measures approximately 3-1/4" x 5-1/8" x 3/8" thick. One Bio-Sponge per package.