White PVC Swing Check Valves, Female Threaded Ends (FPT) Size:1-1/4" FPT 3 5000gph 20

3 5000gph 20

These little plastic bio balls have an enormous amount of surface area for the growth of bacteria for biological filtration

Safe for fish

reducing back-pressure on the pump

White PVC Swing Check Valves, Female Threaded Ends (FPT) Size:1-1/4" FPT 3 5000gph 20Check valves are essential when using a waterfall filter in conjunction with a pond skimmer. 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. Check valves are also essential when an external pump is being used. The check valve prevents the water from draining back into the pond or reservoir, keeping the external pump