Review on Efficient & Reliable: Square Schneider Electric 9013FSG2J21M4 Differential for Optimal Performance by Mark Greenwood

The low pressure cutoff provides some protection if the supply dries up. I'm saying something since the supply is just starting to fluctuate, if there is no leakage you can catch the pump running between on and off (50psi). Heat causes plastics near the pump to soften, lose strength, and fail. By instructing users to look out for the first sign of bubbles in the water and change tanks, you save money and downtime.