Product Description:Item Type:Aquarium Filter SpongeMaterial:CottonColor:BlackFeature:Non-toxicSize:50 cm/19.69"*50 cm/19.69"*2 cm/0.79"Features:1. The elastic density is moderate, the light shading is good, reducing the algae growth. The dense holes are moderate and beneficial to the cultivation of high-density nitrifying bacteria, biochemical cotton to decompose excreta and feed residue, improve the best cleaning effect of water filtration and reduce the mortality of fish.2. The fabric is thickened, strong and durable with strong permeable, more thorough filtration, thickened 30% ultra-high density fiber, more meticulous filtration, more effective decomposition of impurities in the water.3. Note: clean once a month without obstruction and deformation.4. When the filter is dirty, you should clean it in time to keep the filtration effect good.5. Biochemical cotton is more resistant to wash than the ordinary sponge and white cotton. It can be reusable.Package Include:1 x Aquarium Filter SpongeNotes:1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors.2. Due to the screen difference, the color may be a little difference from what you expect, please allow it.