Model Aquatic Health Code Change Requests for Cyanuric Acid On Demand

Professional Training

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Summary: Cyanuric acid (CYA) has been a topic of debate since the introduction of chlorinated isocyanurates for recreational water treatment. With the work of the Chlorine Stabilizers Ad Hoc Committee, we now have a new tool for evaluating the chemistry and other factors that contribute to the risk of recreational water illness. However, we are still left with the judgment calls defining how much is too much CYA and how best to regulate its use. This presentation will review the current MAHC change requests in light of the data and assumptions that are used in the model from the Ad Hoc Committee, as well as the limitations of those data and assumptions. Learning Objectives: • Examine existing data, and limitations of the existing data regarding cyanuric acid • Review the use and limitations of the model produced by the CMAHC Chlorine Stabilizers Ad Hoc Committee • Discuss risk management and factors that aid in determining what level of risk is acceptable • Analyze the uses and limitations of various approaches to regulating cyanuric acid and chlorine residuals Presenter Bio: Ellen Meyer is Product Safety and Government Affairs Manager with Sigura's Water Treatment business, a leading global supplier of pool and spa chemicals. Ellen has a B.S. from The College of William and Mary and a Ph.D. in chemistry from Northwestern University. She has been working in water treatment for over 25 years. Ellen is a former chair and current participant of the Recreational Water Quality Committee of PHTA and has participated on various Model Aquatic Health Code committees, including the Technical Review Committee and the writing committees for contamination burden and risk management. She currently serves on the cyanuric acid ad hoc committee and Technical Review Committee for the MAHC, the NSF task group for pool chemical evaluation, and the AWWA disinfectants standards committee.