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Nonprivate swimming pool outlets shall be ample in size and located at the low points of the pool. The grating areas shall be sufficient to decrease the possibility of clogging, or of suctions dangerous to the safety of the bathers. This section shall be deemed to have been satisfied when the following conditions are met:
1. Each low point in the pool is capable of being completely drained by emptying the pool to waist line. In cases where gravity drainage cannot be accomplished an adequate pump and appurtenances are available to effect complete drainage for emptying.
2. There are no flat areas near the outlets on which bottom deposits may accumulate.
3. The area of the grating openings is not less than 10 times the outlet pipe area for outdoor pools.
4. The grating is of such design that it cannot be fully removed by bathers and will not injure their fingers; and
5. Upward or “reverse flow” circulation systems utilizing outlets in or near the shallow end overflow gutters (inlets in the deep portion) are of satisfactory hydraulic design for the adequate return of the water to the filter plant.