8D Aquarium Filter Sponge 8-Layer No Glue durable fish tank sponge filter aquarium accesories water filter Biochemical Cotton Product name: 8D honeycomb filter cotton Product Size:50*10*2cm; 40*30*2cm; 50*40*2cm; 120*30*2cm; 120*50*2cm. Product Features: 1.8 layers of filtration. Cultivates nitrifying bacteria while purifying water. 2. Honeycomb hole design, easy to filter impurities. 3. Over 200 washes will not rot. 4. Using environmentally friendly materials, high temperature hot melt process, no glue, adhesive, no peculiar smell, no harm to fish. 5. Good water permeability, no clogging, and anti-overflow. 6. Arbitrary cutting, no hair loss. 7. Suitable for a variety of filtration systems, fish tank bottom filter, fish tank top filter, external filter bucket, water curtain filter box, wall-mounted filter box, fish pond filter, etc. How to use: 1. Measure the size and cut to the appropriate size. 2. Fresh and clean with water. 3. The filter cotton can be used normally only when it is completely soaked. Special Note: When the filter cotton is used in a dry state, there is a high probability of splashing water or water impermeability, which can be avoided after soaking. 8 layers of filtering: 1. Three-dimensional honeycomb grid distribution: divert water, filter residue. 2. Three-dimensional fiber hydrophobic layer: prevent water blocking, filter impurities. 3. Precision mesh cloth: Absorb impurities and odors, purify water. 4. Glue-free nano-biochemical cotton: cultivate nitrifying bacteria and inhibit harmful bacteria. 5. Fiber biochemical cotton: deep purification and filtration of water quality. 6. Precision mesh cloth: Absorb impurities and odors, purify water. 7. Three-dimensional fiber hydrophobic layer: prevent water blocking, filter impurities. 8. Three-dimensional honeycomb mesh distribution: split water, filter residue. Purchase Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2.Please allow 1-3cm measuring deviation due to manual measurement.