... short(about 10 angstroms), salt, colloid, bacteria, heavy metal ion, organic compound, viruses and bacillus can be removed, and we ... the principle of filling kation and anion resin in exchanging pole, using ion-exchange resin to exchange with calcium, magnesium and natrium ... and salt, does not melt. Resin is of large quantity exchanging, long wearable, good absorbing, small expanding, long life and ...