Tetra Filter Aquarium Cartidges, Removes Odors and Discoloration, Ready to Use, Small Whisper Filters, 6 Count

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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. CL EAN WATER MADE SIMPLE: Small size fits Tetra Whisper 3i Internal Filters. CONVENIENT: Replacement filter cartridges are fully assembled and ready to use. USAGE: Change monthly or sooner if there is reduced water flow. Show more