TOC can originate from the feed water used to produce UPW, within the components utilized to Express the UPW (additives from the manufacturing piping products and solutions or extrusion aides and mould launch agents), from subsequent production and cleaning operations of piping devices, or from filthy pipes, fittings, and valves. https://newsprospect.com/the-ultimate-guide-to-pure-water-cleaning-with-a-water-fed-pole-for-solar-panel-cleaning/