12 Va. Admin. Code § 5-460-260
Each swimming pool shall be provided with satisfactory equipment for the determination of hydrogen-ion concentration (pH) ranging from 6.8 to 8.0. Satisfactory equipment shall also be provided for the determination of residual chlorine content ranging from 0.0 to 1.0.
§ 35.1-13 of the Code of Virginia.
Derived from VR355-35-05 § 26, eff. March 1, 1962.