FILTER MEDIA : Ceramic ring, filter sponge, activated carbon, bio balls Removes odors, discoloration, and impurities to keep water crystal clear. Phosphate free. Safe for both fresh and saltwater tanks. Fast working and long lasting. it can be used in seawater or freshwater. Flexible and easy to use, you can add them in canister filter, top filter, fish pond filter or bottom filter etc. Each filter media ball is 16mm in diameter which is easy to clean.
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