3. Specifically, which contaminants does a reverse osmosis system remove?

A reverse osmosis system can treat for a variety of contaminants including:

Aluminum, Arsenic, Asbestos, Atrazine, Benzene, Chlorides, Chlorine, Copper, Cryptosporidium, Cyanide, Fluoride, Giardia, Lead, Mercury, Nitrates, Radium, Radon, Silver, Sodium, Sulfide, Trichloroethylene, and Total Trihalomethanes. NOTE: In California, State law requires that any reverse osmosis manufacturer or installer making specific health claims for a drinking water product must have that product tested and certified by a State approved lab.