Tetra Whisper Small Filter Cartridges for Aquariums, 2 Count, Ready to Use, Fits Tetra Whisper Filters for Fish Tanks 1 - 4 Gal

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About This REPLACEMENT CARBON FILTER: Keeps aquarium water crystal clear – removes odors and discoloration. CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste. FI TS 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. Keeps water crystal clear Removes odors and discoloration Easy to use Two small, disposable filter cartridges Fits Whisper In-tank 3i It is recommended that you replace your Whisper Bio-Bag when water begins to overflow excessively from the Wonder Tube chamber, or once per month. Show more