Large Aquarium Replacement Filter Cartridges compatible with Multiple Model Filter For use with Aqueon QuietFlow LED PRO Power Filter Sizes 20, 30, 50, 75 For use with Aqueon QuietFlow Power Filter Sizes 20, 30, 50, 55/75 For use with Aqueon QuietFlow'E Internal Power Filter Size 40 For use with Aqueon Canister Filter Sizes 200, 300, 400 For use with Zilla Basking Platform Filter For use with Zilla Aquatic Reptile Internal Filters Size 40 For use with Coralife Marine Filter with Protein Skimmer Unit Size: 6.54*5.43 inches (Filter Cartridges) 4*0.8*0.8 inches (Filter Pads) Add Extra 5-Stage Filtration System for Aqueon QuietFlow Filter Stage1: Dense cotton mesh removes particles and debris. Stage2: Activated carbon removes toxins, odors and discoloration. Stage3: Zeolite absorbs harmful components, balance the pH value of water. Stage4: Dense cotton mesh removes particles and debris. Stage5: Ammonia Reducer Filter Pad provides a stage of water treatment before water returns to the aquarium. Nutshell activated carbon has more developed pore structure, and more uniform pore distribution, and longer life. Compare with traditional charcoal, our processed activated carbon has super adsorption and cleaning ability. Better and faster absorption of the filth and sundries. Offer clean and healthy water for fishes. Compared to crushed granule zeolite, our spherical zeolite is cleaner and more advanced, It can adsorb ammonia, heavy metals and other harmful components. Balance the PH value to achieve a stable water state. Improve the fertilization efficiency of aquatic plants, make your aquatic plants grow faster and healthier. Package Content: 16+8 Counts 16 counts filter cartridges and 8 counts filter pads NOTE: If necessary please cut to suitable length according to your filter, and few dust on its surface will produce during cutting.