UF is often used as pretreatment to an RO. The UF removes the majority of particulates that fouls an RO, as well as colloids, harmful bacteria, most viruses, and parasites such as cryptosporidium and giardia. The RO removes the remaining bacteria and viruses, dissolved salts, dissolved organics, color, taste, and odor.
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Removes high molecular-weight substances, colloidal materials, and organic and inorganic polymeric molecules.
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Low molecular-weight organics and ions such as sodium, calcium, magnesium chloride, and sulfate are not removed.
