ANSWERS: 1
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The amount air that goes in the bladder section of a well pressure tank is 2 psi below the cut-in pressure on the well pump. Cut-in pressure is the pressure at which the pump turns on. For example, for a pump that comes on at 30 psi, the tank bladder pressure will be 28 psi.
Source:
How to Set or Adjust the Air Pressure in Bladder Type Water Storage & Pressure Tanks
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