In the membrane degassing process, N2 combo mode is commonly used to achieve high O2 removal performance to a ppb level. However, because a N2 supply is needed in N2 Combo mode, running costs increase significantly and immense space is needed for a N2 supply device. To resolve this issue, SEPAREL® delivers exceptionally high O2 removal performance using only vacuuming. Consequently, initial and running costs are reduced. Additionally, SEPAREL delivers a variety of benefits, such as space and weight reduction.