A method and system of ozone treatment diverts a portion of water from a
flow of water in a conduit; injects an ozone-containing gas into the
portion to provide an ozonated portion; recombines the ozonated portion
with the flow of water in the conduit; and regulates the diverted portion
to provide a minimum diverted portion flow rate according to flow in the
conduit and proportion of ozone in the injected gas.