White PVC Spring Check Valves, Slip Ends (SLIP) White Pure Pond Bomb is a

Pure Pond Bomb is a fast-acting

CrystalClear® KnockOut™ PLUS is an all natural

(1) Diffuser O-Ring (APD-06

thereby preventing bacterial infections and parasites

Barley Straw Extract is safe for fish

White PVC Spring Check Valves, Slip Ends (SLIP) White Pure Pond Bomb is aCheck 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