§ 16.15.120. Inlets and outlets.

A.

Inlets for fresh or repurified water shall be placed to allow uniform circulation of water and maintain a uniform disinfectant residual throughout the pool. Inlets shall be submerged at least 18 inches below the water surface to reduce the escape of chlorine or other disinfectants. Pools installed after December 23, 1993 shall be tested by the operator with a crystal violet water distribution test or its equivalent to determine and adjust the recirculation pattern. This test shall be conducted in the presence of a department representative, and shall be approved by the department.

B.

Anti-vortex main drains shall be used in the deepest part of the pool and shall be covered with grates that cannot be easily broken or removed by bathers. The maximum velocity of water passing through the drain may not exceed 1.25 ft/sec at 100 percent of the design flow rate.

C.

If the pool is more than 30 feet wide, multiple main drain outlets shall be provided. These outlets shall be spaced not more than 20 feet apart, nor more than six feet from the side walls of the pool.

D.

Fill and draw pools are prohibited. Flow-through pools may be allowed if a waiver of provisions is granted under 16.15.080.

(AO No. 99-11, § 6, 2-9-99)