White PVC Swing Check Valves, Slip Ends (SLIP) Size:4" Slip Then just open the shut-off

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

8000 grit (#R72080)

which adds more surface area and provides a non-abrasive area for bacteria

There are several different styles available on this page:

the Ultima II patented cyclonic backwash separates the waste and flushes it out the waste line for easy cleaning

White PVC Swing Check Valves, Slip Ends (SLIP) Size:4" Slip Then just open the shut-offCheck 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