The tubular static mixer is an ideal device for the instantaneous mixing of water with coagulants, flocculants, and disinfectants. It features high mixing efficiency, reduced chemical consumption, and compact size. Composed of two sets of mixing units, it operates without external power. As water flows through the mixer, it undergoes three effects: flow division, cross mixing, and reverse swirling, achieving a mixing efficiency of 90–95%. Design specifications: (1) The pipe diameter of the mixer is selected based on the economic flow velocity, generally calculated at 0.9–1.2 m/s. For pipe diameters exceeding 500 mm, the maximum flow velocity can reach 1.5 m/s. If conditions permit, increasing the pipe diameter by 50–100 mm can reduce head loss. (2) The basic configuration of the mixer consists of three sections, with a head loss of approximately 0.4–0.6 m. The number of sections can be adjusted based on the characteristics of the mixing medium.