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7 <br />R. TURNOVER TIME (3124B) <br /> 1. SPA Pool — one-half hour or less. <br />Wading Pool — one hour or less. <br />Temporary Training Pool — two hours or less. <br />._/.1_. 4. Public Swimming Pool — six hours or less. <br />S. RECIRCULATION (3125B AND 116064) <br />.4/ 1. Flow velocity not to exceed 10 feet per second on inlet piping and 8 feet per second on <br />suction piping. (Note: Check manufacturer's recommendation for maximum gpm suction <br />flow thru skimmer.) EXCEPTION: Maximum flow velocity not to exceed 6 feet per second <br />on suction of wading pools when 100% of the pump's flow comes from the main drain <br />system. <br />iL 2. Pressure gauge on filter influent and effluent lines. <br /> 3. Vacuum gauge on suction type filters. <br />Approved flowmeter accurate within 10%. <br />Valve identification with directional flow. <br />T. PUMP CAPACITIES — DESIGN FLOW (3126B) <br />Pressure D.E. — 60 foot head. <br />Vacuum D.E. — 40 foot head and 20 inches vacuum on the suction side. <br />Rapid sand —45 foot head. <br />.rfrt. 4. High rate sand — 60 foot head. <br />5. Cartridge — 60 foot head. <br />U. WATER SUPPLY (3127B) <br />1. Permanently installed line. EXCEPTION: Spa pools, temporary pools and pools less than <br />1500 gallons are exempt. <br />At' 2. Air gap, vacuum breaker, or double check valve attached to permanently installed line. <br />V. FILTER REQUIREMENT (3128B THROUGH 3131B) <br />Rapid sand — maximum 3 GPM per square foot; backwash minimum 12 GPM per square <br />foot. <br />D.E. — maximum 2 GPM per square foot, maximum 2 1/2 GPM for continuous feeding of filter <br />aid for pools 2000 square feet or more. <br />High rate sand — suggested maximum 15 GPM per square foot; backwash minimum 15 GPM <br />per square foot. <br />Cartridge - .375 GPM per square foot, or less as per manufacturer — must be NSF approved.