Water competency entails more than a perception of just being able to swim and an operational definition of water competency is necessary for learn-to-swim program evaluation and policy development. To devise an operational definition, members of the American Red Cross Scientific Advisory Aquatic subcouncil surveyed nine key national (United States) organizations, 14 international organizations, and 19 other key informants involved with water safety and swimming activities for their requirements for swimming in the "deep end." The most frequently reported variables included (a) distance swum, (b) floating or treading water, (c) entrance into water unassisted, and (d) exit from the water unassisted. The subcouncil proposed that water competency include the following: (1) entry with total submersion; (2) recovery to the surface and float or tread for at least 1 min; (3) turn 360° and orient toward an exit point; (4) level off and move on front and/or on back position for at least 25 yards; and (5) exit from the water. We note that water competency is influenced by conditions of the aquatic environment (e.g., water temperature, movement, depth) into which the person may be introduced, and that skills demonstrated in one aquatic environment may not transfer to another. Our proposed operational definition for water competency provides an initial framework for an expanded version that may be expanded to be used globally.

Water competency entails more than a perception of just being able to swim and an operational definition of water competency is necessary for learn-to-swim program evaluation and policy development. To devise an operational definition, members of the American Red Cross Scientific Advisory Aquatic subcouncil surveyed nine key national (United States) organizations, 14 international organizations, and 19 other key informants involved with water safety and swimming activities for their requirements for swimming in the "deep end." The most frequently reported variables included (a) distance swum, (b) floating or treading water, (c) entrance into water unassisted, and (d) exit from the water unassisted. The subcouncil proposed that water competency include the following: (1) entry with total submersion; (2) recovery to the surface and float or tread for at least 1 min; (3) turn 360° and orient toward an exit point; (4) level off and move on front and/or on back position for at least 25 yards; and (5) exit from the water. We note that water competency is influenced by conditions of the aquatic environment (e.g., water temperature, movement, depth) into which the person may be introduced, and that skills demonstrated in one aquatic environment may not transfer to another. Our proposed operational definition for water competency provides an initial framework for an expanded version that may be expanded to be used globally.

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Corollary questions:Does evidence exist to support an optimal age for acquiring swimming and aquatic skills? Does evidence exist to support a universal order of acquisition for swimming and aquatic skills? Does evidence exist to identify the most appropriate purposes and methods for aquatic programs for young children?

Cryptosporidium has caused the majority of waterborne disease outbreaks in treated recreational water venues in the USA for many years running. This research project evaluated some common US swimming pool filters for removing Cryptosporidium oocysts, 5-µm diameter polystyrene microspheres, and 1-µm diameter polystyrene microspheres. A 946 L hot tub with interchangeable sand, cartridge, and precoat filters was used at room temperature for this research. Simulated pool water for each experiment was created from Charlotte, NC (USA) tap water supplemented with alkalinity, hardness, chlorine, and a mixture of artificial sweat and urine. Precoat (i.e., diatomaceous earth and perlite) filters demonstrated pathogen removal efficiencies of 2.3 to 4.4 log (or 99.4-99.996%). However, sand and cartridge filters had average Cryptosporidium removals of 0.19 log (36%) or less. The combined low filter removal efficiencies of sand and cartridge filters along with the chlorine-resistant properties of Cryptosporidium oocysts could indicate a regulatory gap warranting further attention and having significant implications on the protection of public health in recreational water facilities. The 5-µm microspheres were a good surrogate for Cryptosporidium oocysts in this study and hold promise for use in future research projects, field trials, and/or product testing on swimming pool filters.