Pelican Water Systems NaturSoft® Systems are the only third-party tested DW-9191 certified water softener alternative with 99.6% prevention of scale buildup.

About the DVGW back to top

The DVGW is an organization that establishes standards and test protocols. It also approves or certifies laboratories to then conduct testing according to those standards and protocols. The same can be said for NSF in the US.

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. Their internal code for the W510 certification is "9191 - Kalkschutzanlage" (scale protection device). In order to obtain the W510 certification seal or certification mark, the applicant has to pass a total of three test protocols: Efficacy (W512), material safety and structural integrity.

Learn more about DVGW 9191 - Water Devices for Scale Prevention

Certification Documents back to top

DVGW DW-9191 Certificate (English) (link opens in new window)
DVGW W 510 Test Standard (English) (link opens in new window)
DVGW W 512 Performance Test Results (German) (link opens in new window)
DVGW W 510 Standard back to top

The DVGW 9191 - Anti-Scale standard uses the worlds strictest guidelines to determine the effectiveness of a system to prevent scale using Worksheet W 510. W510 combines 3 testing requirements that all systems must pass: 1) Structural Integrity, 2) Microbiological Testing (W 270 and KTW tests) and 3) Performance in Scale Prevention (W512). Unlike the NSF acceptable passing level of 50% for performance claims, the DVGW protocol for scale prevention performance (W 512) requires 80% or better to pass. In order to obtain a certification under DW-9191 with test report W 510 you must pass at least 4 separate tests, plus the W 510 requirements. The W510 test simulates over 2 years of normal customer water usage (200,000+ gallons), making it one of the most comprehensive anti-scale standards in the world.

As part of the Pelican NaturSoft® line of products, we submitted one of our anti-scale NaturSoft® system to the DVGW for certification under the DVGW 9191. The 9191 is already the most difficult and all-encompassing test in the world for anti-scale, requiring a minimum of 80% to pass, however we wanted to challenge ourselves even more. The system submitted by Pelican put NaturSoft® into the most challenging test parameters the DVGW could certify and the results speak for themselves. Having passed all 5 requirements of the 9191, Pelican's NaturSoft® system submitted for testing was certified by the worlds highest anti-scale standard with a performance rating of 99.6%. Using the success of the Pelican NaturSoft® system that passed DVGW 9191, Pelican developed a full line of NaturSoft® products providing proven, tested 99.6% scale prevention from small cartridge systems up to high flow light commercial and everything in-between.

DVGW W 512 - Performance Testing back to top

The DVGW W 512 standard is the most stringent of its type in the world. In order to be subjected to the most rigorous test protocol possible, sparing no expense, we have commissioned to have our equipment performance not tested in the US , but tested by a DVGW certified laboratory in the home country of the standard itself, Germany. The test aims to simulate real life conditions over an exceptionally long period of time using some extremely challenging natural well water.

DVGW W 270 & KTW Assessments - Microbiological Testing back to top

To protect drinking water from microorganisms on non-metallic materials, the DVGW indicated the necessity for adherence to the requirements set out in the DVGW Code of Practice W 270 "The growth of microorganisms on materials intended for use in drinking water systems - examination and assessment!". DVGW also established KTW Assessments which test all plastic parts, coatings, rubber and lubricants to UBA and BGA guidelines to ensure chemicals are not leeched into your water.

Why we publish our test data and others do not back to top

True in both Europe and the US, a certification is a pass/fail proposition. The certification states that the applicant has passed and fulfilled the requirements of the standard. Individual test results are not published in either jurisdiction. The reason for that is due to the minimum requirement to past those tests. For example, NSF 42 requires at least 50% reduction in chlorine in order to pass performance claims. That means a product claiming certification may only remove 50% at the end of filter life. As a result most companies wont publish their test data, fearing the consumer seeing their low results at end of filter life.

Pelican publishes its test data because we acheived a 99.6% scale prevention, with DVGW, rating during the entire length of the test. No other system has received a certified rating that high.

Note: Just 1/4" of scale build-up can increase heating costs by 40% or more. Observe the scale build up on the untreated side after only 3 days of operation.


Certified and Tested to NSF/ANSI Standard 61 for material safety and tested according to NSF/ANSI 42 for structural integrity in all 50 states, including California

Pelican Water Systems NaturSoft® Systems are IAPMO Certified to NSF Standard 61 for material safety and tested to NSF 42 for structural integrity only, making them certified in all states.

A water softener is any device, substance or process that when applied will result in any, or all of the following benefits to varying degrees in the areas of scale reduction, improved cleaning / housekeeping and subjective improvements in personal care without the use of sodium/potassium chloride.

About IAPMO Research and Testing (IAPMO) back to top

IAPMO Research and Testing, Inc. is a product certification body which tests and inspects samples taken from the supplier's stock or from the market or a combination of both to verify compliance to the requirements of applicable codes and standards. This activity is coupled with periodic surveillance of the supplier's factory and warehouses as well as the assessment of the supplier's Quality Assurance System.