4" x 15" 100 Micron Felt Filter Sock

Filter Socks are an essential part of aquarium filtration. They remove excess food, detritus, organic wastes, and other particulates to give you crystal clear water. Specs: 100 Micron Filtration - filters better but you will have to change them more often. Crystal clear water! Standard 4 inch ring - made of high quality thick plastic unlike other socks that use inferior plastics. Fits all 4" filter sock holders. Polyester Felt material - using felt as a filter sock material has it's advantages such as removing micro bubbles from your overflow. Micro bubbles won't pass through the felt material as they would a mesh material. Reusable - When your filter sock needs to be cleaned we include washing instructions in every order to get the most uses out of your socks. *These socks do not fit IceCap sumps