For WFI (Water For Injection), TOC is the most important control parameter. A classical analyser will only give you an update periodically (e.g. every 6 minutes). Have you thought about what can happen in the meantime? If you want to know, it’s best to opt for a continuous TOC analyser.
Contrary to expectations, such an online continuous analyser is even simpler to build than periodic analysers. No pumps, no membranes, no heat exchanger, etc. So virtually nothing can break. As a result, uptime is also high, with a low maintenance cost. Add to this the built-in diagnostics that give you preventive warnings when maintenance is required and you know what to choose!