Marina Bio-Clear Slim Filter Cartridge

• Ideal for goldfish, they contain zeolite and Ceramitek for optimum filtration
• Zeolite effectively absorbs toxic ammonia and reduces stress on fish in your tank
• Ceramitek, a highly porous, ceramic biological filter medium, optimizes biological filtration to support the growth of good bacteria
• These genuine replacement filter cartridges are specifically designed for use in the Marina Slim S10, S15 or S20 aquatic filter
• 3 pack