This Aquaclear 20 Hob (Hang-On Back) Maintenance & Replacement Filter Media Kit Includes 4 Items: The Aquaclear 20 Activated Carbon Inserts 45G-1 Pack, The Aquaclear 20 Biomax Media 42G, The Aquaclear Filter Foam Insert 1 Pack, 2 Gokul Brands Aquarium Filter Media Bags
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