Using sodium hypochlorite, 15% hydrochloric acid, and 25% sodium chlorite as precursors, the chemical-based generators in the P-3M Chemical Series produce high-purity ClO₂. The series design utilizes a two-stage reaction module operating under a vacuum. Sodium hypochlorite reacts with the hydrochloric acid to produce chlorine gas. In the second stage, the chlorine gas reacts with 25% sodium chlorite to produce chlorine dioxide. Each generator in the P-3M Chemical Series produces high-purity chlorine dioxide suitable for municipal drinking water, food processing and industrial applications. Generators are available in automated, semi-manual and manual models.