The Red Flex Reef Sump is designed specifically for saltwater systems. This sumps features a modern red and white acrylic design. Water flows through the two overflow ports, into our proprietary bubble diffusers and through the 4 inch 200 micron filter socks. Each sump includes an overflow panel where the water can escape into the sump if your socks overflow. The Red Flex is equipped with a dosing, probe and wire holders, easily maintained by the built-in fastener. Water levels exiting the refugium chamber can be adjusted between 6 to 9 inches via the adjustable flow gate, depending on your specific needs. It also Includes flexible hoses, 4 inch Micron bags and the foam block sponge.