A method and apparatus for producing hydroxyl radicals in a fluid chamber in an electrochemical cell comprising at least one cathode, at least one anode and at least one source of photolyzing radiation. The method comprises causing an electrochemical cell to produce hydrogen peroxide in the fluid, and causing at least one photolyzing radiation source, such as UV-LED, to photolyze the hydrogen peroxide to produce hydroxyl radicals. The fluid treatment apparatus includes: a structure defining a fluid chamber; at least one cathode facing into the fluid chamber; at least one anode facing into the fluid chamber; and a photolyzing radiation source operable to emit photolyzing radiation into at least one electrochemical cell portion of the fluid chamber, which is suitable for producing hydrogen peroxide.
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