(a) Inlets. Pool inlets must be arranged to produce a uniform chlorine or equivalent disinfectant residual throughout the pool.
(1) Each inlet must be equipped with an adjustable orifice or valve so that the flow of water to various portions of the pool may be adjusted.
(2) The minimum number of pool inlets required is determined by pool volume as indicated in Table II below.
(3) The fill pipe to a pool must have an air gap of six inches above the pool coping or be protected by a double check backflow preventer assembly.
(b) Outlets. Pool outlets must be arranged to produce a uniform circulation of water throughout a pool.
(1) At least one outlet must be provided at the lowest point of the floor to permit complete drainage of the floor area, except in vinyl pools of less than five feet in depth.
(2) If the width of a pool is more than 40 feet, multiple outlets must be provided. In this case outlets must be not more than 10 feet from each sidewall.
(3) If the exit velocity exceeds two feet per second, a National Sanitation Foundation approved, or equal, anti-vortex outlet must be used.
(4) Outlet gratings in the bottom of a pool must be securely fastened and must have a cross- sectional area of at least four times the cross-sectional area of the discharge pipe.
(5) A pool must be equipped with pipe connections which permit the pool to be emptied as well as recirculated, except vinyl pools of less than five feet in depth.
(c) Water disposal.
(1) Backwash from a filter must go to the sanitary sewer or a separation tank. Filter backwash may go to an approved septic tank system if a sanitary sewer or separation tank is not available.
(2) Pools drained for repairs or cleaning must drain to the sanitary sewer in compliance with the Dallas Plumbing Code, or to a natural drainage course if no sanitary sewer is available or sanitary sewer drainage would be too slow.
(3) A deck drain may go to a lawn, leaching field, dry well, or, if necessary, to a natural drainage course. (Ord. 15256)