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SWIMMING POOLS § 20-41 Sec. 20-36. Pumping equipment. The pumping equipment of a swimming pool shall have sufficient capacity to discharge the volume of water for the required turn-over of the pool against the maximum head in the recirculation system. The pump used for backwashing sand filters shall have sufficient capac- ity to backwash the unit at the rate of at least twelve (I2~TM galIons per minute pex s~uare foot of filter area against the maximum head developed during backwashingL (Ord. of 5-10-77, § 94.713D Sec. 20-37. Hair and lint catcher. - Th~ hair and lint catcher of a recirculation system required by this article; shall be installed ahead of the filter pump and shall be 'designed and located so that it can be easiIy and simply dismantled for cleaning and inspection. (Ord. of 5-10~77, § 9-1.714]) Sec. 20-38. Rate of flow indicator, The recirculation system required by this article shall be equipped with a rate-of-flow indicator reading in gallons per minute, located so as to indicate the rate of flow of the effluent from the filter and also the rate of backwash in gallon per minute in sand 'or anthracite coal filters. '(Ord. of 5-10-77, § 9-1.716]) Sec. 20-39. Suction cleaner. A suction cleaner shall be provided for every swimming pool. Where the suction cleaner is operated by the recirculation pump, a device shall be provided for throttling the flow from the pool outlet, and the suction cleaner line shall be connected through the hair and lint catcher. (Ord. of 5-10-77, § 9-1.717]) Sec. 2040. Chemical feeding and testing equipment. . (a) Means shall be provided for regulating the feeding of chemicals to the water in the recirculation system of a swimming pool. The installation of mechanically operated, positive chemical feeders or open-type chemical machines is required for swimming pools having an area in excess of one thousand five hundred (1,500) square feet or having a capacity of sixty thousand (60,000) gallons or more. The installation of closed type solution pots is prohibited. (b) Each swimming pool shall be provided with satisfactory equipment for the determina- tion of hydrogen-ion concentration (pH) ranging from 6.8 to 8. SatiSfactory equipment shall also be provided for determination of residual chlorine content ranging from 0 to 1.0 ppm. (Ord. of 5-10-77, § 9-1.718], [10]) Sec. 2041. Chemical content of water. (a) The chlorination equipment shall be operated so as to maintain a free chlorine residual content of not less than 0.5 ppm at all points throughout the swimming pool water when there are bathers present. 1195