Section R309-525-25 - Operation and Maintenance(1) Water system operators must determine that all chemicals added to water intended for human consumption are suitable for drinking water use and comply with ANSI/NSF Standard 60.(2) No chemicals or other substances may be added to public water supplies unless the chemical addition facilities and chemical type have been reviewed and approved by the Director. The Director shall be notified prior to the changing of primary coagulant type. The Director may require documentation to verify that sufficient testing and analysis have been done. The primary coagulant may not be changed without prior approval from the Director.(3) During the operation of a conventional surface water treatment plant stable flow rates shall be maintained through the filters.(4) All instrumentation needed to verify that treatment processes are sufficient shall be properly calibrated and maintained. As a minimum, this shall include turbidimeters.Utah Admin. Code R309-525-25