In this video, Dr. h.c.. Andreas Ludwig Kalcker simply and clearly, with facts and scientific data, what CDL-CDS is, how and why it works and much more, based on scientific studies and measurements - a really impressive video! Official Website: https://andreaskalcker.com/en/ Books un USA: https://cleanhandsnj.com/ Books in EU : https://www.narayana-verlag.com/advanced_search_result.php?search_redirect=&queryFromSuggest=false&search_area=&keywords=kalcker