Specifically designed for the Fluval Betta Aquarium Kit (6 US Gal / 20 L model), the Betta Poly-Carb Cartridge offers effective 2-in-1 mechanical and chemical filtration for clean and clear water.

Key Features: 

• Mechanical and chemical filter media
• Carbon-impregnated polyester cartridge 
• Effectively traps fine debris and contaminants
• Removes harmful toxins, discolorations and odors
• For best results, replace every 2-4 weeks
• Convenient 4-pack format