I found an instruction here (in German) -
https://hygi-cdn2.azureedge.net/imag...8bad07fc8f.pdf. I used Google's translator to learn that the product is not meant to be diluted. It does say it's for professional use only. Google's translator is here -
https://translate.google.com/
BTW, the product is not available in the United States, according to the Amazon listing here -
https://www.amazon.de/dp/B00FWSHFKI/?tag=curiua0ca-21