Only fits for 6Watt 500L / h 4-in-1 Internal Aquarium Filter Biochemical-sponge can effectively filter waste and improve the circulation system to maintain a clean water environment. Replace or clean filter sponge every two weeks or sooner for optimal performance. Easy to seperate and clean,absorbs odors and discoloration,provide a healthy water for your aquarium Included 4Pcs Biochemical-sponge only
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