Red Sea 4" Reefer Filter Sock Thin-Mesh 225 Micron

225 micron thin-mesh aquarium filter bags are perfect for new setups and after heavy maintenance or whenever there is a lot of particulate matter in the water. They are also suitable as a holder for other mechanical or chemical filter media. The monofilament construction of these bags makes them very easy to clean. These bags are now used in REEFER™ and MAX-S™ Systems