Hair entrapment is a failure mode shared by swimming pools, wading pools, spas, hot tubs, and whirlpool bathtub appliances. When hair is entrained in the discharge flow through a suction fitting or drain, it’s withdrawal will generally be resisted by gravity, drag, friction, buoyancy and interference. Large withdrawal forces obviously lead to a horrifying safety problem. In an attempt to manage the magnitude of these forces the pool industry introduced their first standard relative to hair entrapment on November 3, 1987; ASME/ANSI A112.19.8M - 1987, Suction Fittings for Use in Swimming Pools, Wading Pools, Spas, Hot Tubs, and Whirlpool Bathtub Appliances.

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