Tetra Medium Whisper BIO-Bag Filter Cartridges

• UNASSEMBLED 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 Easy to assemble and easy to replace
• USAGE Change monthly or sooner if needed