This standard applies to both new and existing facilities. With the ongoing drought impacting Texas and other southwestern states, the ANSI/APSP/ICC-13 2017 American National Standard for Water Conservation Efficiency in Pools, Spas, Portable Spas and Swim Spasis becoming more important. This standard covers methods and technologies to increase the efficient use and conservation of water for residential and public recreational pools, spas, portable spas and swim spas equipped with a filtration circulation system.