When a pipe rehab crew installs a CIPP liner, they typically do the job in just a few hours, and then move on to the next project. But that’s not the end of the story. CIPP is designed to last for decades, and the wastewater systems that use it need to be confident in its efficacy. In most cases, installers are required to submit a sample of every liner installed for third-party testing. Only once testing is complete and the results are approved and reported is the job really “done.”