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18-29-1202.5  Overflow gutters.
   Nonprivate swimming pools shall be entirely surrounded by overflow gutters having the necessary pitch to prevent any accumulations, having ample size to carry off normal amounts of water introduced into them, and having easy access for cleaning. This section shall be deemed to have been satisfied when the following conditions are met:
   1.   The overflow gutter extends around the entire perimeter of the pool; the overflow gutter edge is level within 2/10 inch (5 mm) on pools smaller than 40 feet (12.2 m) by 85 feet (25.9 m) and 2/10 inch (eight mm) on larger installations.
   2.   The overflow gutter bottom has a pitch of not less than 3 inches (75 mm) in 10 feet (3.05 m).
   3.   The drains are a maximum of 15 feet (4.57 m) on centers.
   4.   The runoff capacity is sufficient to carry away all normal amounts of water splashed or displaced into them without flooding of the overflow gutter.
   5.   The overflow gutter has a minimum depth of 4 inches (100 mm).
   6.   The overflow gutter is of the open, roll-over or semiprocessed type, having a smooth finish and having an opening sufficient to permit satisfactory cleaning of the overflow channel.
   7.   Overflow drains that discharge to a sewer have a free-fall discharge with an atmospheric break of 2 inches (50 mm) minimum.
   8.   Drain lines shall be at least 2 1/2 inches (64 mm) in diameter.
   9.   Satisfactory proof can be furnished to the buildings department that adequate runoff capacity will be obtained by other arrangements or modifications in gutter design proposed for use in “closed” or reverse flow systems of recirculation.
   Exceptions:
      1.   At pools having a water surface area of 1,500 square feet (139.35 m 2 ) or less and which are expected to have only light skimmer loading, automatic surface skimmers may be provided in lieu of overflow gutters in the proportion of one skimmer per each 500 square feet (46.45 m 2 ) or fraction thereof. Such skimmers shall be built into the wall and have an automatically controlled equalizer pipe to prevent air- lock in the suction line.
      2.   Skimmer return piping shall be not less than 2 inches (50 mm) in diameter. The equalizer pipe shall be not less than 2 inches (50 mm) in diameter and be located at least 1 foot (300 mm) below the lowest overflow level of the skimmer.
18-29-1202.6  Equipment for removal of sediment.
   The nonprivate swimming pool shall be provided with equipment to remove sediment and other accumulations from the bottom of the pool. This pool equipment shall comply with the following requirements:
   1.   The pool shall be provided with a satisfactory suction cleaner system of either the built-in or portable type (built-in types are preferable).
   2.   Sufficient suction and capacity shall be provided to remove all normal accumulations from the pool bottom.
   3.   Vacuum pipes shall be 3 inches (76 mm) minimum diameter, and vacuum hoses shall be 2 inches (51 mm) minimum diameter.
   4.   Vacuum fittings shall be installed at 8 inches (203 mm) below normal water level in the pool.
18-29-1202.7  Recirculation system.
   The recirculation system in a nonprivate swimming pool shall consist of pumping equipment, hair and lint catcher, and filters, together with all necessary pipe connections to the inlets and outlets of the pool and for backwashing the filters. As an integral part of the system, equipment shall be provided for disinfecting the water and adding any necessary chemicals and make-up water.
18-29-1202.7.1  Turnover of pool contents.
   The entire system and all its component parts shall be capable of producing a six-hour turnover of the entire contents of the pool. Recirculation system piping shall be of the materials indicated in Article 7, with the exception that they may be constructed of Schedule 40 PVC.
18-29-1202.8  Equipment required.
   Adequate pumping equipment shall be provided in every nonprivate swimming pool. Pumping equipment shall be provided in accordance with the following:
   1.   The pump has sufficient capacity to discharge the volume of water required for a six-hour turnover of the pool against the maximum head in the recirculation system.
   2.   The pump used for backwashing sand filters has sufficient capacity to backwash a filter unit at the rate of at least 15 gallons per minute per square foot (56.8 lpm/0.09 m 2 ) of filter area.
   3.   The pump develops a good suction when the pipes for a suction cleaner are connected to the recirculation system.
   4.   A compound vacuum-pressure gauge is installed on the recirculation pump suction line; and a pressure gauge on the pump discharge line.
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