CodePudding user response:
Lz to control the logic of understanding is not clear, 'Assuming that low water level L, high water level H
When the water level is less than L, start pumping pump
When the water level is higher than H, pump closed stop pumping
Water is used, water levels fall slowly,
When the moment to L, pump open again...
Therefore, when the water level between the L ~ H, pump it is possible to work or not work, not as lz said don't work