Also regarding pressures used for transfer, I regularly pressurise the vessel to 2 bar to transfer carbonated beer via a filter to the receiving keg. I carbonate at around 0.8 bar while cold conditioning (I like many of my beers on the spritzy side), then set the high side pressure to 2 bar and the pressure relief on the receiving keg to 1.4-1.6 bar. This allows enough pressure differential across the filter that it doesn't take all day to transfer, but the receiving vessel is still pressurised well above the carbonation level of the beer to prevent breakout. Could probably use somewhat lower pressures but they're round numbers, easy to see on the gauge, and the three settings should be outside the margins of error on the gauges so as not to overlap unintentionally.