This picture shows a typical Spring Check Valve. If you have a pool Spring Check Valve installed in your pool circulation system and you notice water running backwards in your pool after you turn off your pool pump, you probably have a clogged Check Valve or one that has failed. With a clear Spring Check Valve, you can see if any debris is in the Check Valve mechanism that needs to be cleared out. See our guide on "How To Clear Debris From a Pool Spring Check Valve". Otherwise you can assume that the Check Valve has failed and needs to be changed. Most damaged Spring Check Valves cannot be repaired and must be replaced. This guide shows you have to replace a Spring Check Valve.
UNION VS NON-UNION - Spring Check Valves come with unions and without unions. If your Spring Check Valve is installed without unions, you will have to cut it out every time you want to clean it or when you have to replace it. If you have an opaque Check Valve, you will have to cut it our just to look at it to see if it is clogged. For these reasons, a Spring Check Valve is usually installed with unions. This guide shows you have to replace a Spring Check Valve with unions. If your Spring Check Valve does not have unions, see our guide on "How To Replace a Pool Flapper Check Valve". The process for cutting out a non-union Check Valve is the same for all Check Valves.
INSERT NEW CHECK VALVE - Place the new Check Valve between the two unions. Make sure the FLOW arrow stamped into the side of the Check Valve is pointing in the direction of your pool's water flow. Note: you will have to buy the complete Spring Check Valve with Unions even though you will not be using the new Unions. Use the new O-rings.