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(d) Rate of flow indicators. The recirculating system shall be equipped with a rate of flow indicator, which has been approved by the administrative authority. The indicator shall read in gallons per minute or liters per minute and shall be located to indicate the rate of flow of filtered water being returned to the pool. The indicator shall be of fixed calibration and properly sized so as to indicate the designed rate of flow at approximately midscale. (e) Hair and lint strainer. At all installations where it is possible for water from the pool to pass through the filters, a strainer shall be provided on the suction side of the pump to prevent hair, lint and other matter from reaching the pump and filters. Strainers shall be corrosion-resistant with openings not over one-eighth inch in size providing a free flow area at least four (4) tzmes the area of the pump suction line at the strainer connecEion and shall be accessible for frequent cleaning. Sec. 34-16. Piping systems. (a) The piping of N.S.F. approved following operations: system for public pools shall be composed materials or equal, designed for the (1) Filling the pool; (2) Washing each filter to waste; (3) Recalculating the pool water equipment; through Ehe treatment (4) Backwashing no waste; (5) Operating suction cleaner; (6) Emptying the pool; and (7) Draining the system. (b). There shall be no direc5 connections between the pool recirculating system and the sewer or the potable water supply. Fill spouts may be located under diving boards, under guard chairs or adjacent to pool ladder handrails. Fill spouts shall be installed a minimum of nwo (2) inches (5.08 centimeters) above the coping, or submersed fill spouts shall be equzpped with a backflow preventer. (c) Waste from backwashing shall be discharged into the sanitary sewer or in a manner approved by the administrative authority.