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Inlets for nonprivate swimming pools shall be submerged, and be located to produce uniform circulation of water throughout the pool without the existence of dead spots, and to carry pool-bottom deposits to the outlets. This section shall be deemed to have been satisfied when the following conditions are met:
1. Rectangular pools not exceeding 40 feet (12.19 m) by 75 feet (22.86 m) have inlets across the shallow end which serve a maximum lineal distance of 8 feet (2438 mm).
2. Rectangular pools with outlets more than 5 feet (1525 mm) from the deep end wall are provided with additional inlets at the deep end on a maximum of 12-foot centers (3.66 m).
3. For pools larger than 40 feet (12.19 m) by 75 feet (22.86 m) inlets are provided on not more than 20-foot (6.1 m) centers in the side walls in addition to the spacing indicated above for end wall inlet fittings.
4. All inlets are designed as adjustable orifices, or are individually valved.
5. All inlets discharge at a depth of 10 inches (254 mm) to 18 inches (457 mm) below the pool overflow level.
6. Proof can be furnished to the satisfaction of the building department that adequate circulation can be obtained by other inlet arrangements, such as in the one of upward or reverse flow circulation system where inlet fittings are proposed for installation in or near the pool bottom.