NSF International has certified vapor control balls, also known as "shade balls," produced by Orange Products. The shade balls met the requirements of NSF/ANSI Standard 61: Drinking Water System Components - Health Effects, which includes requirements for all products that come in contact with drinking water. The shade balls are 4" diameter high-density polyethylene balls that are intended for vapor control in potable water tanks and reservoirs with an average depth of 9' or more...
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July 3rd, 2008,
NSF certifies vapor control balls 
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