Water treatment for in ground pools can be done using standard pool chemicals or with newer technologies such as Saltwater Systems (AKA - Saltwater Filters) or mineral sanitizer's which make pool water much gentler and easier on the skin. Both the Pool Frog Mineral System and the Saltwater Chlorine generators are "green" systems in that there's no need to touch messy chlorine or deal with chlorine fumes.
Scroll Down to see all Saltwater Chlorination Systems by Manufacture.