@Eti Thanks for this constructive comment. I strongly agree with you that scaling and fouling may increase the labor, maintenance as well as operational cost. Even though, scaling and fouling is unavoidable. But there are lot of fouling preventive measures available that include pretreatment technologies, redesign of treatment system components, and replacement of the existing membrane materials. Coming to next point, these pretreatment technology is a very basic step in conventional water treatment processes. For instance, the typical lifespan of a commercial RO membrane is around 3 to 7 years depending on the application. Thus, one-time investment may be useful for a span of 5 years. In this case, atleast the labor cost (only) can be reduced after the establishment of centralized water treatment system. Kindly let me know your valuable comment on this.