36Exempt water treatments

36 Exempt water treatments (1) Section 34 and section 35 do not apply to the addition by the responsible utility to a water network of— (a) a chemical for the purpose of clarifying, purifying or otherwise treating the water in that network at a concentration that is not injurious to public health; or (b) fluoride at a concentration not exceeding 1.0mg/L. (2) For subsection (1) (b), a concentration is taken to be a concentration of 1.0mg/L if the concentration— (a) would result in an average concentration of 1.0mg/L during a period of 24 hours; and (b) does not exceed 1.2mg/L.