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of the water. Where skimmers are used for private pools, there shall be at least one skimming device for each 1,000 square feet (93 m2) of surface area or fraction thereof. For public pools where water skimmers are used, there shall be at least one skimming device for each 600 square feet (55.8 m2) of surface area or fraction thereof. Overflow gutters shall not he less than 3 inches (76 mm) deep and shall be pitched to a slope of one unit vertical to 48 units horizontal (1:48) toward drains, and constructed so that such gutters are safe, cleanable and that matter entering the gutters will not be washed out by a sudden surge of entering water.
421.5.4 Walkways: All public swimming pools shall have walkways not less than 4 feet (1219 mm) in width extending entirely around the pool. Curbs or sidewalks around any swimming pool shall have a slip resistant surface for a width of not less than 1 foot (305 mm) at the edge of the pool, and shall he so arranged as to prevent return of surface water to the pool.
421.5.5 Steps and ladders: At least one means of egress shall be provided from private pools. Public pools shall provide ladders to other means of egress at both sides of the diving section and at least one means of egress at the shallow section; or at least one means of egress in the deep section and the shallow section if diving boards are not provided. Treads of steps and ladders shall have slip resistant surfaces and hand-rails on both sides, except that handrails are not required where there are not more than four steps or where the steps extend the full width of the side or end of the pool.
421.6 Water supply: All swimming pools shall he provided with a potable water supply, free of cross connections with the pool or its equipment.
421.6.1 Water treatment: Public swimming pools shall be designed and installed so that there is a pool water turnover at least once every 8 hours. Filters shall not filter water at a rate in excess of 3 gallons per minute per square foot (0.0020 m3/s * m2) of surface area. The treatment system shall he designed and installed so that at all times when the pool is occupied, the water is provided with excess chlorine of not less than 0.4 parts per million (ppm) or more than 0.6 ppm, or excess chloramine between 0.7 and 1.0 ppm, or disinfection shall be provided by other approved means. Acidity/alkalinity of the water shall not be below 7.0 or more than 7.5. All recirculating systems shall he provided with an approved hair and lint strainer installed in the system ahead of the pump.
Private swimming pools shall he designed and installed so that there is a pool water turnover at least once every 18 hours. Filters shall not filter water at a rate in excess of 5 gallons per minute per square foot (0.0034 m3/s * m2) of surface area. The pool owner shall be instructed in the care and maintenance of the pool by the supplier or builder, including treatment with high-test calcium hypochlorite (dry chlorine), sodium hypochlorite (liquid chlorine) or equally effective germicide and algaecide, and the importance of proper pH (alkalinity and acidity) control.
421.6.2 drainage systems: The swimming pool and equipment shall be equipped to be emptied completely of water and the discharged water shall be disposed of in an approved manner that will not create a nuisance to adjoining property.
421.7 Appurtenant structures: All appurtenant structures, installations and equipment, such as showers, dressing rooms, equipment houses or other buildings and structures, including plumbing, heating and air conditioning systems, shall comply with all applicable requirements of this code.
421.7.1 Accessories: All swimming pool accessories shall be designed, constructed and installed so as not to be a safety hazard. Installations or structures for diving purposes shall be properly anchored to insure stability.
421.8 Equipment installations: Pumps, filters and other mechanical and electrical equipment for public swimming pools shall be enclosed in such a manner as to provide access only to authorized persons and not to bathers. Construction and drainage shall be arranged to avoid the entrance and accumulation of water in the vicinity of electrical equipment.
421.9 Enclosures for public swimming pools: Public swimming pools shall be provided with an enclosure surrounding the pool area. The enclosure shall meet the provisions of Sections 421.9.1 through 421.9.3.
421.9.1 Enclosure: The enclosure shall extend not less than 4 feet (1219 mm) above the
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