guys I also have been researching this and have been told numerous times that UV treatment with RO is a great application, but in all of these Amazon links I opened I see RO Filtration but No UV treatment canister/cylinder . The RO is great when your water has many issues, but one of the worse is E-Coli & Coliform UV scramble & kill the two types of bacteria's, my water samples came back really very good ( tested in an accredited lab in the states)in Cabarete..except Coliform and hardness of 12 & since our complex has a 10,000 gallon holding cistern Under the Swimming pool, the maintenance people have been throwing in chlorine to treat, but if they step up the Chlorine & UV was used complex wide after the Domestic water pressure pump , no one in the complex would need bottles anymore. My 2 cents -Serge