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..having thought about this for a bit, the pressure between the liner and the tank will be the same as the water, the air acts as a cusion to smooth the water flow. So, just enough air for a cusion. I'll turn the pump off, and drain some water out, and then pump some air in.. Say increase from...

Hi, I'm looking after a freinds holiday let while they are away. They have a private borehole water supply. Water is pumped to a tank, c. 50 cm diameter by 1.0 m high. The tank has a pressure valve on top, and a square box to control "cut in/cut out" pressures (currently 80 and 120 psi)...