{"product_id":"fish-tank-filter-sponge-biochemical-cotton-multi-layer","title":"6D\/5D Multi-Layer Fish Tank Filter Sponge – Biochemical Cotton","description":"\n\u003ch2\u003e6D\/5D Multi-Layer Biochemical Filter Sponge for Aquariums\u003c\/h2\u003e\n\u003cp\u003eUpgrade your aquarium's filtration system with this premium \u003cstrong\u003e6D\/5D Multi-Layer Fish Tank Filter Sponge\u003c\/strong\u003e. Engineered with 5 or 6 dense layers of high-quality, glue-free biochemical cotton foam, this filter media delivers superior mechanical and biological filtration for both freshwater and marine aquariums of all sizes.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Layer Biochemical Design:\u003c\/strong\u003e 5D (5 layers, 1 cm thick) or 6D (6 layers, 2 cm thick) construction maximizes surface area for beneficial nitrifying bacteria to colonize, promoting a healthy nitrogen cycle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo-Glue Foam Construction:\u003c\/strong\u003e Free from adhesives — safe for fish, shrimp, corals, and all aquatic life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Porous Structure:\u003c\/strong\u003e Dense yet porous foam prevents blockages while trapping debris, waste, and excess feed effectively.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExcellent Water Permeability:\u003c\/strong\u003e Allows strong, consistent water flow through the media without restricting your pump or filter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrimmable to Any Size:\u003c\/strong\u003e Easily cut to fit any canister filter, sump, hang-on-back filter, or custom filtration setup — no waste.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReusable \u0026amp; Durable:\u003c\/strong\u003e Rinse and reuse multiple times. The thick, resilient foam maintains its shape wash after wash.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Flexible:\u003c\/strong\u003e Soft, easy-to-handle material that fits into tight filter chambers without fuss.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFreshwater \u0026amp; Marine Compatible:\u003c\/strong\u003e Versatile enough for all aquarium types and setups.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e100% Brand New \u0026amp; Unused:\u003c\/strong\u003e Every piece is factory fresh, ready to install directly into your filtration system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable Sizes\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background:#f2f2f2\"\u003e\n      \u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eDimensions\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eThickness (5D)\u003c\/th\u003e\n      \u003cth style=\"border:1px solid #ddd;padding:8px\"\u003eThickness (6D)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e50 × 11 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e40 × 30 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e50 × 40 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e120 × 30 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e120 × 50 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e200 × 40 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e1 cm\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px\"\u003e2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Fish Tank Filter Sponge (size and model as selected)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Good Aquarium Filtration Matters\u003c\/h3\u003e\n\u003cp\u003eMaintaining a healthy aquarium requires effective biological and mechanical filtration. Beneficial bacteria that colonize porous filter media help break down ammonia and nitrites, keeping your water chemistry stable and your fish thriving. Learn more about aquatic environment best practices from the \u003ca href=\"https:\/\/www.epa.gov\/watersense\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eU.S. Environmental Protection Agency (EPA)\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between the 5D and 6D fish tank filter sponge?\u003c\/h4\u003e\n\u003cp\u003eA: The 5D sponge features 5 layers of biochemical cotton with a thickness of 1 cm, while the 6D sponge has 6 layers and a thickness of 2 cm. The 6D version offers a larger surface area for beneficial bacteria and is better suited for heavier bio-loads or larger aquariums.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I cut the filter sponge to fit my aquarium filter?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The biochemical cotton foam is easy to trim with scissors or a knife to fit any filter housing, sump compartment, or custom setup. Simply measure your filter chamber and cut accordingly — no special tools needed.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this filter sponge safe for freshwater and saltwater (marine) aquariums?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This biochemical filter sponge is compatible with both freshwater and marine aquarium setups. Its glue-free, aquatic-safe foam material makes it suitable for fish, invertebrates, and coral reef tanks.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I clean and maintain this filter sponge?\u003c\/h4\u003e\n\u003cp\u003eA: Simply rinse the sponge gently in a bucket of used aquarium water (never tap water, which contains chlorine) to remove accumulated debris. Avoid scrubbing too aggressively to preserve the beneficial bacterial colonies. The sponge can be reused many times before needing replacement.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between the 5D and 6D fish tank filter sponge?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 5D sponge features 5 layers of biochemical cotton with a thickness of 1 cm, while the 6D sponge has 6 layers and a thickness of 2 cm. The 6D version offers a larger surface area for beneficial bacteria and is better suited for heavier bio-loads or larger aquariums.\"}}, {\"@type\": \"Question\", \"name\": \"Can I cut the filter sponge to fit my aquarium filter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The biochemical cotton foam is easy to trim with scissors or a knife to fit any filter housing, sump compartment, or custom setup. 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