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HOW SDX RETRO WORKS BETTER SINGLE-DRAIN - SDX Retro may be used to cover a single suction outlet providing one of the options is followed from ANSI/APSP-7 Section6.3 and Appendix B. See excerpt of options on page 2. DUAL-DRAIN SYSTEM Vacuum Breaker Backup. As with any dual-drain system, one drain is intended to be a vacuum breaker for the other in the unlikely event a swimmer completely blocks one of the SDX RETRO drains. If this were to happen, the pump is able to safely draw water from the second drain. Dual-Drain Spacing. Most suction safety codes require dual-drains to be installed three feet apart, pipe to pipe, however some codes require three feet between drain covers. For this reason, Dual SDX RETRO piping is spaced three (3) feet, ten (10) inches apart. Vertical Dual-Drain Installation. The purpose of the vertical dual-drain installation is to make it less likely two people can approach two drains at once. Effectively, the second drain would be at an individual's feet SDX RETRO HIGH FLOW SAFETY DRAIN SYSTEM DESIGN SDX RETRO is a circulation drain, not intended to remove debris. SDX Retro is a universal replacement drain cover submerged suction outlet suitable for Single or Multiple Drain use on the wall and floor. This is to keep debris and sand from collecting on and around the low velocity SDX RETRO cover. Do not locate suction outlets on seating areas or on the backrest of such seating areas. The maximum flow rate for each SDX RETRO drain is 200 gpm on the floor —192 gpm on the wall. This flow rating allows for pumps up to 3 hp to operate efficiently. For pumps with higher flow rates or systems with multiple pumps on a common manifold, additional SDX RETRO drains may be added. Do not exceed the maximum allowable flow rate stated on the suction fitting. The velocity at the opening to the SDX drain at the maximum rated flow of 200GPM is 1.485 feet per second. For multiple drain systems where more than two drains are used, the maximum flow rate is calculated per ANSI/APSP-7 Section 4.6 as shown in the following chart DESCRIPTION MAXIMUM SYSTEM FLOW FLOOR MAXIMUM SYSTEM FLOW WALL MINIMUM FLOW RATING OF EACH COVER % MAXIMUM SYSTEM FLOW RATE One SDX Retro High Flow Safety Drain 200 gpm (756 Ipm) 192 gpm (726 Ipm) 100% Two SDX Retro High Flow Safety Drains 200 gpm (756 Ipm) 192 gpm (726 Ipm) 100% Three SDX Retro High Flow Safety Drains 300 gpm (1136 Ipm) 288 gpm (1090 Ipm) 66.7% Four SDX Retro High Row Safety Drains 400 gpm (1514 Ipm) 384 gpm (1456 Ipm) 50% *Table derived from ANSI/APSP-7 Section 4.6 Table 1 Pipe size. To design an efficient suction system in accordance with national swimming pool standards, the following pipe sizing guideline should be followed: SUCTION PIPE SIZE MAX RESIDENTIAL GPM MAX PUBLIC GPM 1 1/20 50 37 82 62 2 1/20 117 88 181 136 313 (200 Max GPM) 234 (200 Max GPM) 9.00 8.00 7.00 6.00 HEAD LOSS CURVE is 400 3.00 2.00 1.00 0.00 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 Flow GPM For technical assistance call 1.800.621.5886 or contact your regional representative 1