What indicates a faulty check valve in a well?

A faulty check valve in a well is indicated by water backspin after shut down. The primary function of a check valve is to prevent the reverse flow of water. When the pump shuts off and water flows back into the well due to a malfunctioning check valve, it results in backspin, which can signify that the valve is not effectively sealing, allowing water to move in the undesired direction.

Backspin not only suggests that the check valve is compromised but also can lead to contamination of the water supply, increased wear on pumps, and potential operational failures. Maintaining a properly functioning check valve is crucial for preventing such issues, ensuring that the water remains securely within the system and does not flow back into the well after the system is turned off.