NSF/ANSI/CAN 50: Equipment for Pools, Spas, Hot Tubs, and Other Recreational Water Facilities defines performance validation, operational safety, and testing criteria for pool and spa products. Product certification to this standard is required by the Model Aquatic Health Code and most U.S. state and local pool codes.

NSF/ANSI/CAN 50 certification provides health effects evaluation criteria for pool chemicals and also requires testing for trace contaminants in chemicals that are used in the treatment and circulation systems of swimming pools, spas, and water parks.

The evaluation criteria for pool and spa treatment chemicals are based on risk assessments for dermal contact, inhalation, and ingestion exposures.

Any chemical used to treat pool or spa water may be evaluated to the requirements of NSF/ANSI 50.

This includes chemicals for water balance, filtration aids, disinfectants, and specialty products.