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【Dual‑Function Filtration Performance】This aquarium filter cotton combines physical filter layer and activated carbon.135x55mm aquarium filter cotton is traps floating residues and absorbs impurities to support cleaner, clearer aquarium water. 【Quick Simple Filter Cartridge Replacement】This fish tank filter pad is user‑friendly for routine maintenance.135x55mm aquarium filter cotton is Simply rinse with cold water to remove fine carbon dust, insert into filter slot to finish replacement within seconds. 【Breathable High‑Density Filter Material】Wall‑mount fish tank filter cotton is made of filter cotton material, this aquarium filter media features good water permeability and absorbency. Solid fibre texture maintains stable filtration performance for fish tank systems. 【Washable Reusable Filter Mat】The fish tank filter cotton can be rinsed for repeated use. This washable filter insert helps cut consumption costs during regular aquarium upkeep work. 【Fit Freshwater & Saltwater Aquariums】High density filter cotton aquarium carbon is dimension:135 x 55 mm. Recommended replacement cycle every 2‑4 weeks according to tank condition. Works for freshwater tanks, saltwater tanks and general aquatic setups with wall‑mount filters.