... substantial amounts of most inorganic chemicals (such as salts, metals, minerals) most microorganisms including cryptosporidium and ... dissolved minerals and metals such as aluminum, arsenic, barium, cadmium, chloride, chromium, copper, fluoride, magnesium, iron, lead, ... . Essentially, reverse osmosis is capable of rejecting bacteria, salts, sugars, proteins, particles, dyes, heavy metals, chlorine ...