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(a) Private residential swimming pools recirculation systems shall consist of pumping equipment, hair and lint catchers, filters together with the necessary pipe connections to the pool inlets and outlets, facilities and pipe connections necessary for backwashing filters, and facilities and equipment for disinfecting the pool water.
(b) The entire recirculating system shall be capable of producing a six-hour turnover of the entire water volume contents.
(c) The recirculation system pump shall have sufficient capacity to discharge the volume of water required for a six-hour turnover of the pool against the maximum head in the recirculating system.
(d) The pump used for backwashing filters shall have sufficient capacity to provide a filter backwash rate of at least 15 gallons per minute per square foot of filter area.
(e) A hair and lint catcher or strainer shall be installed on the suction side of the circulation pump to prevent hair, lint and other extraneous matter from reaching the pump and filters. Hair and lint catchers shall be so designed that they can be easily dismantled for cleaning and inspection and shall be so located as to be easily accessible for cleaning. The design features shall be as follows: Water passes through the strainer from the outside; the strainer is made of noncorrosive material; the width or diameter of strainer openings is not more than one-eighth inch; the area of the strainer openings shall be at least five times the cross-sectional area of the inlet pipe to the strainer.
(f) Recirculating systems shall contain rapid pressure filters. Sufficient filter area shall be provided to filter the entire contents of the pool in six hours at the rate of not more than three gallons per square foot of filter area per minute. The filter backwashing facilities shall be sufficient to backwash at the rate of 15 gallons per minute per square foot of filter area. All backwash water and effluents shall be discharged to the sewer through an indirect connection. Pressure filters shall be equipped with readily accessible air relief valves, loss of head or pressure gauges on the inlet and outlet pipes, and an access head or hole large enough to permit inspection, maintenance and repair work. Sight glasses that can be easily removed for cleaning shall be provided in the effluent line from the filter units.
(g) Equipment shall be provided for the disinfection of all pool water. Any disinfection method using materials other than chlorine compounds shall be subject to the approval of the board of health. Disinfection equipment installed for the use of chlorine compounds shall have sufficient capacity to maintain a minimum free chlorine residual of 0.5 parts per million. The disinfectant shall be introduced into the recirculation system ahead of the filters.
(h) Gaseous chlorination systems shall not be made use of as a disinfection method for pool water.
(Prior code § 61-18.15)