NSF International
has announced new requirements in NSF/ANSI Standard 61: Drinking Water
System Components -- Health Effects for regenerated and reactivated media
used to treat public drinking water supplies. Most U.S. states currently
require media and other products used to treat public drinking water to be
certified to NSF/ANSI Standard 61 in order to verify that they will not
contribute harmful levels of contaminants into drinking
water.
NSF Intl. recently
announced that it has certified the first geothermal pipes to Canadian
Standards Association’s standard C448: Design and
Installation of Earth Energy Systems for Commercial and Institutional
Buildings NSF is the only organization that certifies
polyethylene (PE) piping for geothermal end use.
The extensive process includes formulation review,
production facility inspection and testing for health effects, performance,
long term hydrostatic, chlorine resistance and quality control.