The mixing elements provide a full radial, wall to wall distribution of the micron size ozone bubbles. The very low pressure drop ensures that it will not affect the efficiency of the pump very much, while providing an increase in the bubble surface area.
A mixer needs to be installed downstream after an injector.
For the best performance from a mixer, maximize the distance between the mixer and the injector. But install the mixer at least 12 inches upstream from a contact tank or the point of usage.