カラムのミクロンサイズを決定する別の方法、3 um を超える場合は 0.45 um、3 um を超える場合は 0.22 um<3um. 0.45 um membranes are typically used for general filtration and particle removal while 0.2/0.22um membranes, or sterilizing-grade membranes, are most commonly used for solution sterilization (bacteria removal).