White PVC Spring Check Valves, Slip Ends (SLIP) Size:2" SLIP and organics (leaves

and organics (leaves

Then just open the shut-off valve to back flush the Savio pond filter

or you will risk killing the beneficial bacteria that have grown on them

or before adding new fishes

White PVC Spring Check Valves, Slip Ends (SLIP) Size:2" SLIP and organics (leavesCheck 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