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Suction side is the inlet to pump. The discharge side (after the pump) should be under positive pressure, relative to pump ∆P (delta P).
If during summer use you accumulated no air then that would suggest as you say something somewhere is weak. You could go around tightening all connections above the floors, if the problem lies beneath floors that's a bit more of a problem.
If during summer use you accumulated no air then that would suggest as you say something somewhere is weak. You could go around tightening all connections above the floors, if the problem lies beneath floors that's a bit more of a problem.