What is the term for the direct method of injecting chemicals into water?

The term for the direct method of injecting chemicals into water is often referred to as pressure injection. This method involves using a pump to create enough pressure to push the chemical directly into the water stream. By applying pressure, this technique ensures that the chemical is thoroughly mixed into the water, which can be essential for various treatment processes, such as disinfection or pH adjustment.

In contrast, other methods like assisted Venturi or unassisted Venturi rely on the natural flow of water through a Venturi device to draw in and mix chemicals, rather than injecting them under pressure. Similarly, suction injection depends on a differential pressure created by the flow of water to draw the chemical in. While these methods can be effective in specific situations, pressure injection is particularly noted for its directness and control over the chemical dosage and timing.