Membrane Autopsy: The physical dissection of an RO membrane and the laboratory analysis of its foulants can be one of the most definitive methods of troubleshooting an RO system. An Avista autopsy includes a wide range of procedures, as shown below, and concludes with our External visual examination Internal visual examination Wet test of the element Chemical identification of surface foulants using: FTIR spectrometer Energy Dispersive X-Ray Spectrometer (EDX) Scanning electron microscope (SEM) Loss on ignition test Cell and dye test Fujiwara Test Summary Recommendations