[Pack of 3] - Cascade Bio-Sponge for Internal Filters Cascade 600 (1 Pack)

The Replacement Bio-Sponge for the Penn Plax Cascade Internal Filter optimizes colonization of beneficial aerobic bacteria and removes ammonia and nitrites.

• Quick and easy to replace
• Convenient, no-fuss replacement sponge
• Replace monthly for optimum water quality

Specifications: Fits Penn-Plax Cascade 300 Internal Filter