White PVC Spring Check Valves, Slip Ends (SLIP) Low Head Nexus Model: Water Volume Inside Bermuda Nexus Model: Water Volume Inside Filter Amount of K1 Micro Media included Amount of K+ Media included Maximum K1 Capacity Nexus220 135 US Gallons 18 liters 50 liters 150 liters Nexus320 222 US Gallons 20 liters 100 liters 300 liters EasyPod (for comparison) 21 US Gallons 18 liters N A 18 liters Natural Finish and Walnut Finish use a solid oak top Check valves are also essential when an external pump is being used The check valve will prevent water in the filter from back flowing into the skimmer when the pump is switched off and keep water in bogs when the pump is turned off and other purposes