1: Set grate or opening size at a dimension or configuration that can not be blinded off by a person(s) or part of a person(s) or otherwise entrap or capture a person(s) or part of a person(s) - under any conditions -or:
A: Limit suction to not over 4.5 Ft of head - reasonably below the danger limit of 5.1 Ft of head by not allowing direct pump suction on any pool/spa suction outlet. Only gravity to the extent of 4.5 Ft of head could be allowed to act.
2: Call for pool/spa suction outlets to be designed so as to provide no physical means of hair entanglement regardless of suction velocities - or:
A: Limit suction velocities to 1.5 Feet Per Second through any suction outlet AND provide for a snap out grate system that would include with it all points of possible hair entanglement so that should hair become entangled therein or therewith that it can be easily removed and brought to the surface by a pull not exceeding 5 pounds in a direction normal to its surface.
3: Provide an environment for the development of new technologies and design to show other avenues that will provide the same or better degree of safety.
Leif Zars 12/26/99