A. Required: A recirculation system, consisting of pumps, filter, water conditioning and disinfection equipment and other accessory equipment shall be provided which will clarify and disinfect the swimming pool volume of water in eight (8) hours or less, thus providing a minimum turnover of at least three (3) times in twenty four (24) hours, except that the recirculation rate shall be increased to provide a six (6) hour turnover for swimming pools subjected to heavy bather loads.
B. Design: All piping shall be designed to reduce friction losses to a minimum and to carry the required quantity of water at a reasonable velocity. Piping shall be of nontoxic material, resistant to corrosion, and also to withstand operating pressures. Pipes shall be identified by color code or tags.
C. Strainers: The recirculation system shall include a strainer to prevent hair, lint, etc., from reaching the pump. Strainers shall be corrosion resistant with openings not more than one-eighth inch (1/8") in size providing a free flow area at least four (4) times the area of pump suction line and shall be readily accessible for frequent cleaning.
D. Vacuum Cleaning System: A vacuum cleaning system shall be provided. When this system is an integral part of the recirculation system, sufficient connections shall be located in the walls of the swimming pool, at least eight inches (8") below the water line.
E. Rate Of Flow Indicator: A rate of flow indicator, reading in gallons per minute, shall be installed and located, preferably on the swimming pool return line, so that the rate of recirculation and backwash rate will be indicated. The indicator shall be capable of measuring flows from a few gallons per minute up to at least one and one-half (11/2) times the design flow rate, and shall be accurate within ten percent (10%) of true flow and shall be easy to read. (Ord. 11-2-3-71, 5-6-1971)
F. Pumps: Pumps shall be of adequate capacity to provide the required number of turnovers of swimming pool water as specified in the Uniform Swimming Pool, Spa, and Hot Tub Code, and shall be so located as to eliminate the need for priming. The pump or pumps shall be capable of providing flow adequate for the backwashing of filters. Under normal conditions, the pump or pumps shall supply the recirculation rate of flow at a dynamic head which includes, in addition to usual equipment, fittings, and friction losses, an additional loss of fifteen feet (15') for sand filters or gravity diatomite filters, and forty feet (40') for pressure diatomite filters, as well as pool inlet orifice less of about fifteen feet (15'). (Ord. 11-2-3-71, 5-6-1971; 1997 Code)
G. Heaters: Swimming pools equipped with heaters shall have a fixed thermometer in the recirculation line at the heater outlet and another near the outlet to the pool. (Ord. 11-2-3-71, 5-6-1971)