【XBBWMRS Large Aquarium Filter Cartridges 100% Compatible with Whisper Filter and Ready to Use】: Our 9 pack of large fish tank filter is suitable for whisper bio-bag Filter 10i 20i 40i IQ20 30 45 60 and PF20 30 40 60, size: 6.22'' X 4.72''. Good idea for any fish tank or aquarium (10-30Gallon 20-40Gallon 30-60Gallon). 【4 in 1 Fish Filter Cartridges, 360° Filtration, Keep Aquarium Fresh and Fish Healthier】: ① Fish tank filter cartridge is wrapped by dense double-sided mesh to capture maximum debris and filter debris and fish waste. ② Super activated carbon quickly removes odors and yellow, leaving the glass of your aquarium free of buildup and keeping the fish tank's water crystal. ③ NEW aquarium filter media Zeo-lite, work to keep PH balance of the water while also removing odors and discolorations. 【NEW LOOK, SAME FUNCTIONALITY, ENSURE SUITABLE FOR WHISPER BIO-BAG FILTER】: ① No messy assembly required, out of the box, and ironing wrapped edge, not easy to leak carbon dust. ②The built-in 12-grid ABS frame distributes zeolite and activated carbon evenly over the inner surface so that each water flow is fully filtered, leaving no place for impurities. ③ABS plastic edge, more suitable for whisper filters, more durable and not easy to deform. 【New Filter Media Zeo-lite, Quickly Remove Ordors, Yellow, Deodorization to Keep The Fish Tank's Water Clean and Clear】：xbbwmrs replacement filter cartridge not only increases the amount of activated carbon on top of the original but also places a new deodorizing filter materials - zeolite, the combination of two filter materials to eliminate odors faster and give your lovely friends a healthy, fresh living environment. 【XBBWMRS Fish Tank Filter Cartridges Services】： If you have any problem understanding or using our xbbwmrs replacement filter cartridges, please don't hesitate to tell us and we will try our best to help you. After many tests by our engineers found that the adsorption of activated carbon and zeolite is limited, it is recommended to replace it in 2-4 weeks to keep the best effect. XBBWMRS Fish Filter cartridge is designed to provide a healthy and clean living environment for your lovely wet-living pets. It offers 4 stages of filtration, super activated carbon and zeolite will quickly remove odours and yellow discolouration, leaving the glass of your aquarium free of buildup. The double-sided dental floss will remove dirt and debris from your aquarium so your fish live in a cleaner, more comfortable environment. Our large size fish tank filter cartridge is suitable for the Whisper Bio Bag Filters 20i 40i IQ20 30 45 60 and PF20 30 40 60. In order for you to use our products better, we give you the following warm tips, which we hope will be helpful to you. Please rinse the aquarium filter cartridge with cold water before use. Please rinse the fish tank filter cartridge with cold water before use. Please replace it every 2-4 weeks for better results. Teenagers should be used under parental supervision. Please do not step on the fish filter cartridge to avoid breaking the carbon particles and affecting the quality. Please avoid direct contact between the replaced filter cartridge and fire source to prevent fire. Please store the fish tank filter cartridge in a cool and dry place.