Biochemical Cotton Foam Filter for Aquarium Fish Tanks

This biochemical cotton foam filter is designed for aquarium and pond use to support biological filtration and maintain water quality.

• Material: thick, durable foam sponge in black color
• Functions to cultivate nitrifying bacteria for breaking down fish waste and leftover food
• Suitable for use in both freshwater and seawater environments
• Multi-porous design prevents blockages and maximizes bacterial adhesion
• Excellent water permeability and dense structure reduce residue buildup
• Can be cut to any size as needed
• Reusable after cleaning
• Recommended replacement every three months to maintain filtration effectiveness