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Wellsfargo IsoBourse : Logiciel Bourse Forex Or Argent Pétrole Analyse Technique Scrum Methodology Pelican PSE2000 Whole House Water Filter & Salt Free Water Conditioner/Softener The DVGW is located in Bonn, Germany. It has its own laboratory by the name of TZW located in Karlruhe, Germany. Beyond that, the DVGW has certified some twenty plus privately owned laboratories throughout central Europe who are authorized to conduct certification testing. The same holds true for NSF. It has its own laboratory and those certified by NSF like WQA, UL and Pace Laboratories to name a few. The DVGW also issues test marks or certifications (i.e. the WQA equivalent of a "Gold Seal") like the "W510" standard. Relating it to the US equivalent, for example a NSF 42 certification for a carbon filter has three components to it: 1) Structural Integrity NSF/ANSI 42-2007a, 2) Material Safety NSF/ANSI 61-2007a Toxicological Extraction, and 3) NSF/ANSI 42-2007a Aesthetic Effects. The DVGW W 512 standard is the most stringent of its type in the world. Third Party Certification and What it means True in both Europe and the US, a certification is a pass/fail proposition.