Silica
In the high purity water processing systems, silica levels are usually the first to increase if there are any glitches during the production.
High purity water systems often measure trace silica as it is a reliable primary indicator of contaminants. Silica is one of the most abundant minerals on the planet and is found in all water supplies. In the chip manufacturing industry, trace silica has the potential to remain on the wafer of microchips as the UPW dries, which can lead to a significant loss in yield.