Check the listing for details. 7" x 32" 200 Micron Polyester Filter Sock w/ Ring - Coralvue. Condition: New. Listed at 17.99 USD. 7″ x 32″ 200 Micron Polyester Filter Sock w/ Ring Micron Rating: 200 Size: 7.06 x 32” Thick floss material ideal for removing small particles Felt Filter Socks are commonly used on overflows to remove small floating particles from aquarium water. This dramatically improve water quality and reduce maintenance on pumps, reduced sump cleaning and less impact on the biological filtration by removing the excessive waste that would otherwise break down in the system. Our Mesh Filter socks come in a variety of sizes in both plastic ring or draw string. Benefits: Adds great mechanical filtration for the aquarium Regular use will result in crystal clear water Removes fine particles like dust, excess food, detritus, organic waste and silt from entering your sump Prevents larger objects like sand, crabs and snails from damaging expensive pump motors Reduces ammonia and nitrate producing organic waste from accumulating with routine sock rotations Listing and template services provided by inkFrog