【袁偉智】評論
(A)microfiltration : 0.1~2 um (細菌)(B)ultrafiltration : 0.01~0.1 um (病毒)(C)nanofiltration :0.001~0.01 um (MW300~1000 organic compound)(D)reverse osmosis:0.001um 以下0.22 um 濾細菌(過濾滅菌)0.45 um 過濾雜質