Reef Crest 100 Micron Filter Sock (7 Inch) Test Kits Suction cup allows placement inside

Suction cup allows placement inside an aquarium just below the water level

helping remove organic impurities

and 5 LED string options

but is most commonly free living on soft bottoms

Reef Crest 100 Micron Filter Sock (7 Inch) Test Kits Suction cup allows placement insideReef Crest 100 Micron Filter Sock (7 Inch) The Reef Crest 100 Micron Filter Sock (7 Inch) is a washable felt aquarium filter sock for finer mechanical filtration and water polishing in compatible sump systems. 7 Inch 100 Micron Sock for Finer Water Polishing The 100 micron felt captures smaller suspended particles than a typical 200 micron sock, making it useful when the aquarium needs clearer water, extra polishing after maintenance or improved