... reverse osmosis (RO),Electrodeionization(EDI),Ultraviolet sterilization (UV),Polishing mixed bed(MB),Terminal micro filter (MF). The pretreatment part ... strictly H2O and the impurities like inorganic salt,heavy metal ion,organic matter,colloid,bacterium,virus ,etc in source ... aicd-base, thereby can products high quality water continuously.Mixed bed refers to taking negative resin and positive resin ...