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You must drain the tank almost to bottom, switch off the pump and water feed to house . Now put in 27-28 psi of air if you have a 30/50 pressure switch. Put in 37-38 if you have a 40/60 switch. It may be necessary to adjust the pressure switch after observing cut in and out.

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Q: How much pressure should be put into a bladderless water tank?
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