Aquarium Reefs Fish Tank Filter Sock Bag Holder Suck Replacement Micron Sump. Description: Filter socks are the best form of mechanical filtration. This is an essential part for wet/dry filter systems, sumps, and diy filters. Removes excess food, detritus and other particulates to lower ammonia levels and other undesirable substances. Used as mechanical filtration for any sumps and diy filters. Type: Aquarium Filter Bag Color: White Quantity: 1Pc Material: Polypropylene Micron Rating for Chooses: 150 Micron(0.15mm)/200 Micron(0.2mm) Size: 105mm x 380mm/4.13" x 14.96" (Approx) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 x Aquarium Filter Bag