Sumpsock | Polyester Felt Filter Sock | 5 Micron Rated | Signed for Strength | Aquariums, Koi Ponds, Pools, Reef Tank | Size #1, 7" x 16" INCREASE WATER CLARITY & QUALITY: Felt filter socks are most commonly used to help collect and trap free floating debris, excess food and detritus, which in turn improves the water clarity and quality of your aquarium and the quality of life of your aquatic population, making them happier and healthier and contributing to longer lives. REMOVES EVEN THE SMALLEST OF PARTICLES: A micron is a unit of measure in the metric system equal to 1 millionth of a meter in length. The human eye cannot see anything smaller than 40 microns in size. Since this felt filter is 5 micron rated, it will capture particles and contaminants that are slightly smaller in size than red blood cells. In this logic, it makes it clear just how much this felt filter sock will capture in your aquarium sump. EASY TO CLEAN: You can wash your felt filter sock in a laundry tub using hot water and a little bleach. Simply wring it out, let it dry and reuse. These felt filter socks have the ability to be reused over and over again. Dont feel like washing the felt filter sock? No problem. Simply throw it away after it has been clogged and purchase new ones. It is recommended to purchase multiples if you do not intend to reuse them. DURABLE MATERIALS: Our food grade felt is made out of polyester which is known to be a strong and flexible fabric that dries quickly. This felt filter sock has also been designed with a carbon steel support ring and hanging strap for extra strength, security and support. Using this type of high quality mechanical filtration device helps to increase the overall life of your filter. CHOOSE CROSSCOURT COMMERCE: We are the go-to supplier of liquid strainers, bag filters and accessories. We offer a wide variety of products to bring ease and convenience into your life, in specialized areas of the market. Customer satisfaction is our number one priority, so please feel free to reach out to us with any questions or concerns that you may have.