Tetra Medium Whisper BIO-Bag Filter Cartridges 3 pack

• REPLACEMENT CARBON FILTER Keeps aquarium water crystal clear – removes odors and discoloration
• CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
• FITS TETRA WHISPER WATER FILTERS Color coded to make it simple to remember which replacement cartridge size to purchase
• CONVENIENT Replacement filter cartridges are fully assembled and ready to use
• USAGE Change monthly or sooner if needed