The chlorination of CPVC gives it a clear advantage over other materials in dealing with common water treatment chemicals. The chlorine molecules present in the CPVC pipe makes it block the chlorine and chloramine from attacking the pipe, making it immune to chlorine destruction and extends its lifespan.
Copper enthusiasts should know that copper plumbing is susceptible to chlorine-related issues. Neither copper nor any other material has such an effective chlorine barrier. Permeation and leaching are other problems that can contaminate water running through the pipe.