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Who tested the bag and what are the results?

The bag was tested by scientific institutes and the industry alike:

  • University of California in Santa Barbara as part of a Patagonia research program
  • Fraunhofer Institut UMSICHT
  • German Textile Research Institut, DTNW
  • Industry partners and clients e.g. Patagonia, Manufactum, Mile

The results are always identical:

  • The GUPPYFRIEND washing bag reduces fiber loss during washing in two ways.
    1. The Guppyfriend reduces the amount of breaking fibers on average: a) 79% for partly synthetic clothes and 86% in case of entire synthetic textiles
    2. Fibrous residues and lints caused by washing are retained by the Guppyfriend and therefore do not pollute the waste water. The determined fiber retention capacity in all test was above 90%, -mostly close to 100%.
  • The amount of fibers that are found in the bag depends on washing conditions and clothing itself.
  • Even after 50 washing cycles the bag and all seams are intact (ISO 6330)
  • Cleanliness after washing: blood, ketchup and chocolate could be washed out properly, the washing degree towards skin fat and clay is sufficient.

To sum up:

The Guppyfriend reduces the fibers breaking significantly, those fibers that do break are hold back reliably, the clothes get clean and -if correctly applied- the Guppyfriend keeps harmful microplastic from entering our rivers and oceans for a long time.

With the objective to reduce microplastic pollution, the results of the ongoing washing tests are translated into information material for customers on how to buy better and wash better and are shared with the industry to accelerate the re-engineering of textiles.


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