Oase’s BioStyle Hang-On-Back Filter Foam Replacement 2 Pack. This replaces the Orange filter foam that is included with all BioStyle models, 30 ppi filter foam traps debris and waste while providing a place for beneficial bacteria to settle. This mechanical and biological filtration results in cleaner, healthier water for your aquarium inhabitants.

• Replaces the Orange filter foam that is included with all BioStyle models
• 30 ppi filter foam traps debris and waste while providing a place for beneficial bacteria to settle
• This mechanical and biological filtration results in cleaner, healthier water for your aquarium inhabitants