Aoplkzn 14 Pack Large Filter Cartridges ，Cartridges Aquariums，Large Replacement Filter Cartridges for Aquariums Compatible with Tetra Whisper Filters 20i,40i/IQ20,30,45,60/PF20,30,40,60

[Compatible Models] Aquarium filter cartridge is compatible with Tetra Whisper Bio-Bag filters 20i/40i/IQ20/IQ30/IQ45/IQ60/PF20/PF30/PF40/PF60 and Tetra ReptoFilter 50 gallons (125 GPH). 12 pack large replacement filter cartridge. Size: 5.1 * 7.1 inches. [Ultra Activated Carbon] The filter contains super-activated carbon, which effectively filters and absorbs impurities in the water, keeping the aquarium water clear and keeping the aquarium glass free of scale buildup. [Double-Sided Mesh] The filter is made of dense dual-sided mesh to capture maximum debris and fish waste. Keep the water source clean and provide a healthy growing environment for fish. [ABS Plastic Holder] The built-in ABS holder distributes the activated carbon evenly for fuller filtration and reduces the frequency of water changes. [Usage Tips] Activated carbon has a limited adsorption capacity and for optimal performance we recommend that you change the cartridge every 2-4 weeks to keep your water clear. (This depends on the specific usage.)