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what type of pump are you using? what do the specifications say how much pressure it can reach? 30mbar happens to be the boiling point of water at room temperature. If you got a moisture problem, the pressure stops at this point during evacuation. Because of this, I degas at least down to 6mbar, at wich the boiling point is at 0°C. And during infusion, I try to maintain a slightly higher pressure, around 6-7 mbar, to prevent further degassing.
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