Aquatic Experts 4 inch Ring 100 Micron Felt Filter sock - Filter Socks for Saltwater Aquarium, Sump Filter Sock, Freshwater Aquarium Socks, Reef Filter Sock - Custom Made in The USA (4"x10.5", 8 pack) - Aqu-2148

• CUSTOM MADE - Our filter socks are constructed only when our factory receives our exact specifications. years of testing produced the perfect blueprint. Other socks may look like ours but if you want THE BEST you have found them. HIGH QUALITY AND REUSEABLE - Solid construction and heavy duty stitching make these socks STRONG AND DURABLE so they CAN BE CLEANED AND REUSED NUMEROUS TIMES. THESE DO NOT FIT RED SEA FILTERS. REMOVES FINE PARTICLES - Our 100 micron filter socks remove much smaller particles from water than 200 micron socks producing POLISHED, CRYSTAL CLEAR AQUARIUM WATER. In order to catch such tiny debris they will clog up faster than 200 micron filter socks. SAFE FOR YOUR AQUATIC FRIENDS - STRICT QUALITY CONTROL ensures our filter socks remain aquarium-safe all the way from our USA manufacturer to you. You can now buy with confidence knowing that your filter socks will not come into contact with any harmful contaminants and will always arrive to your door safe for your aquatic friends. TIPS - You will receive our PROFESSIONAL CLEANING INSTRUCTIONS INCLUDED with your filter socks.