Researchers at the Faculty of Engineering of the University of Debrecen have investigated a physico-chemical treatment method for so-called bathroom greywater (BGW). This is water that has already been used once in the bathroom (gently) but can be reused for certain non-potable purposes after treatment. The findings were published in the journal Results in Engineering. This article has also been honored with a Count István Tisza Foundation for the University of Debrecen and the University of Debrecen Publication Award.