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1. Rinse all media before use to remove any dust or debris. 2. Place activated carbon in the designated media slot in your filter. 3. Add bio balls and ceramic rings to the biological filter section. 4. Replace media every 4-6 weeks for optimal performance. Universal Fit for Most Filter Systems:Perfectly compatible with hang-on-back filters, canister filters, internal filters, and sump tanks. No need to worry about mismatches—just place the media in your filter and enjoy hassle-free filtration. 3-Layer Filtration for Crystal Clear Water:Activated carbon media traps discoloration and dissolved impurities; bio balls provide large surface area for biological filtration; ceramic rings support stable water conditions. Work together to keep your aquarium water clean and clear. Dual-Scene Use for Freshwater & Saltwater Tanks:Ideal for tropical freshwater aquariums, cold-water fish tanks, and marine saltwater setups. Whether you’re keeping guppies, goldfish, or corals, this media kit delivers consistent filtration performance. Double Pack for Long-Lasting Use:Get 2 sets of carbon media, bio balls, and ceramic rings in one purchase. Reduce the frequency of filter media replacement and save your time and money on repeated buying. Safe & Easy to Use for All Aquarists:Simply rinse the media with tank water before use—no complicated steps required, suitable for both beginners and experienced fish keepers. Color Black Brand Name AOQIVIS Model Name AOQIVIS-Aquarium-set Item Weight 5.79 pounds Manufacturer AOQIVIS Item model number AOQIVIS-Aquarium-set Included Components 2 Filters Target Audience Keyword Fish Specific Uses for Product Aquarium Filtration Item Package Dimensions L x W x H 10.31 x 7.28 x 6.06 inches