... inorganic salt, heavy metal ion and completely get rid of colloid, microbiology organic materials, germ, protozoa, pathogens, baceria, inorganic ... acid or sodium hydroxide optional) 7. The lifespan of the whole system is long, operation simple, the ... inorganic salt, heavy metal ion and completely get rid of colloid, microbiology organic materials, germ, protozoa, pathogens, bacteria, inorganic ...