... (about 10 angstroms), salt, colloid, bacteria, heavy metal ion, organic compound, viruses and bacillus can be removed, and ... working with RO facilities combining with ion-exchange bed or DI, ion-exchange bed is working by ion-exchange resin in electrolyte solution, can be ... high purity water, which can not be substitute. Ion-exchange equipment is of kation exchanging quipment and anion equipment. ...