A continuous process, in-line mixer with zero moving parts. It produces mathematically predictable layer generation in a wide variety of liquid-liquid, liquid-solid and gas-liquid applications. The mixer can be installed quickly in new and existing pipelines at low initial and operating costs. Since it has no moving parts, there is no wear, and as a result, no maintenance is required. The Mahr ISG mixer is ideal for applications in which mixing elements must be removed for fast, easy cleaning, such as for sanitary requirements. This mixer excels at blending materials with large viscosity ratios, as high as 250,000:1 and greater.