Ozone gas can be injected in water in different ways. The two most used techniques are:
A venturi injects the ozone gas in the water via a vacuum.
The advantages of a venturi are: the compact installation, possible high yield (up to 90%). A side stream injection with pump is used.
A diffuser works under pressure. A diffuser creates a bubble column.
The advantages are high yield, simple construction and advantagous for high flow rates (i.e drinking water systems). Disadvantages are the required surface area and the need of tall buildings to increase the efficiency.
Advantages of Venturi injector instead of diffuser:
-High solubility of ozone in water than diffusers (50-70% without pressure and up to 98% with booster pump)
The venturi system, although it is more efficient is used commonly in industrial applications followed by a filter but relies on a constant water flow to work. This could be a problem in remote or domestic installations where the flow and suction cannot be monitored continuously. Also there is always the danger that, despite non return valves being placed in line, water could return through the venturi and damage the ozone generator.
The Bubble diffuser system, although not as efficient, can be left on a timer to run for dedicated hours during the day blowing very fine ozone gas bubbles in to the water. Although not as efficient this can be a Plug and Play DIY system which can be left to run either continuously or for set periods of time.