TOC? Table of contents? Totally cool? Do surgeons operate daily? Everything is wrong: TOC stands for Total Organic Carbon, in German: all organic carbon. It's good that we've clarified that, but what does that tell us now? The TOC CONTENT is a cumulative parameter for the organic load and thus contamination of the water. If you want to measure it, the organic matter must oxidize, which is usually done with the help of thermal combustion, then the resulting CO2 is measured or the carbonic acid formed is made visible using the increase in conductivity.