Red Sea Reefer Filter Media Cups can be used in place of standard filter socks and be filled with a variety of filter materials. The design of the cup allows it to be dropped into the sock holder and can used with a wide variety of media, including: filter pads, filter floss, biological media, carbon, and GFO. 4" X 8". Includes media bag. Fits all Red Sea Reefer sump filter holders.
