What should the setting of a sealed float or diaphragm switch be in relation to the pump turn-on level?

The setting of a sealed float or diaphragm switch should be configured to turn off the pump when the water level reaches a certain point above the pump's turn-on level. This means that the float or diaphragm switch will activate when water rises above this level, ensuring that the pump can operate efficiently without running dry. If the switch is set too close to the pump turn-on level, it could lead to frequent cycling of the pump, potentially causing wear and tear or even failure. Setting the switch to activate 2 or 3 inches above the pump turn-on level provides a buffer that helps maintain constant water movement and prevents the pump from turning on and off too frequently, which is critical in maintaining the lifespan of the pump and the overall health of the septic system.