Description: Quality Material: aquarium sponge filter are made of high quality sponge, of which there are 8 layers of material respectively, so that the product has the function of adsorbing impurities and odour, purifying water and purifying and filtering water in depth Professional Filter Pad:Our pond filter foam pad is thin and durable, good toughness, not easy to tear, heat insulation, self-cleaning function, so that dust is not easy to adhere to it, so that the effect of water purification is more obvious Pump Protection:pond foam is used as a pre-filter for aquarium pumps. It prevents larger foreign objects from entering the pump, by capturing these particles, the filter cotton helps to extend the life and efficiency of the pump Multiple Sizes:Our fillers come in 2 sizes, you can choose according to your needs, they are:30x20cm (1pc); 50x11cm (1pc) Multiple Uses:The sponge filter is perfect for shrimp, fish tanks or breeding tanks, and can also be used for other hydroponics, eliminating suspended solids and pollutants in aquarium water, ensuring clear water quality, increasing oxygen levels Specification: Color: As Shown. Material: Sponge. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: 8D Pond Filter Sponges*1