The NAD’s investigation found that Tennant’s claims could not to be adequately borne out by the tests that they presented. They include, especially, the Tennant slogans:

-       ecH2O electronically converts water into a superior cleaning solution

and

-       ecH2O outperforms [many] conventional chemicals

The NAD also welcomed the fact that the Tennant Company is no longer using the slogan:

-       ecH2O technology makes water perform like a powerful detergent.

The cleaning equipment manufacturer Nilfisk-Advance submitted Tennant’s advertising claims to the NAD. Nilfisk-Advance reported on the NAD’s findings in a Press release.

Kärcher too is currently engaged in legal proceedings against Tennant’s British and German subsidiaries in connection with similar advertising claims for the ec-H2O technology and has taken its case to the UK Advertising Standards Authority and the Stuttgart District Court.

Link to NAD Press release

Link to Nilfisk-Advance Press release

Since 1996 MicroMol GmbH has worked – and continues to work – on a number of complex issues relating to the development, evaluation and validation of cleaning agents and disinfectants and cleaning and disinfection processes. In biological systems especially the use of tensides and a knowledge of their chemistry is very widespread and important. MicroMol GmbH is also accredited by the German Accreditation Agency (DAkkS) for a number of test procedures. MicroMol’s Dr. Andreas Dreusch is an auditor appointed by the German Accreditation Agency for the areas of biology and chemistry and therefore inspects other laboratories or public bodies to ensure that their work complies with the standards.

Dr. Dreusch, you can clean quite well using water alone, can’t you?

You can clean very well with normal tap water. However, water is no good for fatty dirt. And that is increasingly widespread. A carton of milk bursts in the supermarket, a sandwich is dropped at a fast-food outlet, in a shopping mall for example, factories have oil and grease stains from machines, and soot. And fat particles are present everywhere where there are a lot of people, such as schools, kindergartens or hospitals.

In other words, to get a surface contaminated with fat or oil really clean, you need to add cleaning agents?

Of course, you can also strengthen the mechanical component when cleaning, by brushing harder or longer. Or you can try to clean with hot water. That won’t work particularly well, but it will make the floor surface look clean. However, in many cases hygienic, reliable cleaning is only possible with the use of cleaning agents that dissolve fats so that they are picked up rather than being spread evenly across the floor.

How clean do scrubber-driers that use ec-H2O technology really clean?

We have examined this technology thoroughly in our laboratory and found that it is possible to achieve good results with these machines. However, the results are just as good as those achieved using normal water. In the case of fatty, that is water-repellent, dirt, we were able to prove clearly that particles are distributed, but not dissolved or removed. The cleaning result was definitely worse than that of machines that use cleaning agents.

http://www.micromol.com

“In the oral proceedings we reiterated our view of the matter clearly and precisely, and it was evident that the Court had familiarised itself very well with the facts of the case. So we look forward in confidence to the pronouncement of judgment at the end of April,” said Markus Asch, Managing Director Professional Products and Deputy Chairman of the Alfred Kärcher GmbH & Co. KG management.

In fact, the agency had merely stated that it was not pursuing the complaint further because its expertise was mainly legal and it did not have detailed knowledge about every product that was available on the market. The Trading Standards Service merely observed that Tennant had submitted evidence in support of its dubious advertising claims, but that it – the TSS – was unable to check the accuracy of the evidence. Accordingly, Tennant continues to have failed to provide scientific proof of the efficacy of the so-called ec-H2O technology.

The reason given by Tennant for this request for an extension of the deadline is that expert opinion was currently being compiled by the Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB). The subject under examination was the effectiveness of the ec-H2O technology.

Till now, Tennant had publicly maintained that the effectiveness of the so-called ec-H2O technology had already some time ago been substantiated by several studies.

In Great Britain, the mass-circulation Daily Telegraph recently carried an article about the Tennant case headlined “Industrial scrubbers under scrutiny over green claims,” while the highly regarded specialist portal The Manufacturer published both an article , “Regulator to investigate Tennant over ‘wonder water’,” and a blog entry, “Manufacturers at risk from false advertising legal loophole,” about the case.

Interview on Wirtschaftswoche.de

You can find an English translation here

In the printed magazine, a shortened version of this text was published.

The production of Tennant’s “processed water” as described in the brochure can be summarised as follows. An electric current from an electrolytic cell in the scrubber-driers used to break down tap water enriched with oxygen into acid and alkaline parts (ionisation). As soon as it comes into contact with the surface to be cleaned, this so-called “electrically activated water” is said to break down dirt into smaller particles and dislodge it from the floor. It is claimed that after about 45 seconds this “activated” water turns back into normal water. All that remains in the machine’s dirty water tank is dirt and water.

Technically, water can indeed be ionised for a very, very short time in an electrolytic cell. However, ions characteristically combine into a neutral water molecule again immediately, within nanoseconds. The water is then back in its original state as far as its cleaning effect is concerned and no longer has any detergent properties.