Feature: 1. Using nanometer material, in addition to taste, anti‑corrosion, anti‑aging, anti‑ultraviolet and other functions. 2. Imitating the principle of wetland water purification, the formation of a dense filter layer, can filter very fine particles, clean water. 3. Ultra‑pliable filament processed by nanotechnology, new dirt intercepting structure, with dirt automatic relaxation function, easy to clean, no dead corners. 4. The filter material with the function of super filtration can completely intercept the dirt on the surface for nitrification and decomposition. 5. Strong shading, reduce the growth of algae, is conducive to the cultivation of highly nitrifying substances. Neutral material does not affect PH, GH, TDS, and has no effect on the water of the aquarium. Specification: Item Type: Fish Tank Filter Bag Material: Plush Polyester Fiber/Polyester Weight: Approx.56g/2oz Length x Width: Approx. 35x16.5cm/13.8x6.5in How to Use1: 1: When in use, place the woolen side outwards and place it on the drip box instead of ordinary filter cotton. 2: Place a filter material in the lower layer to cultivate nitrifying substances and regulate water quality.How to Use2: The super-flexible wool is facing upwards and placed in the wet and dry separation box to replace the traditional filter cotton. Placed in a large drip box. Reminder: be sure to soak in boiling water for 30 minutes before use, the effect will be better. Cleaning method: super-flexible hairs face down. Rinse under running water or put it in the washing machine for automatic cleaning.. Package List: 1 x Fish Tank Filter Bag Note: 1.It is tied to the outlet of the filter with the fluffy side facing. 2.Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.1) For the first use, rinse with clean water or original tank water.2) Use the original tank water to rinse off the waste and residues during each cleaning. Do not use detergent or hot water to avoid the loss of nitrifying substances.3) It needs to be cleaned in batches. Do not clean all the filter materials and filter cotton in the tank at one time, so as to avoid the loss of nitrifying substances and cause water quality fluctuations4) This product belongs to aquarium products, please do not use it for other purposes.5) This product is a consumable, in order to maintain good efficiency, please replace it regularly.