We are glad to announce our first publication in the framework of the CASCADE HYDROPONICS at the MDPI. The title of the article is: Implementation of the Circular Economy Concept in Greenhouse Hydroponics for Ultimate Use of Water and Nutrients by Angeliki Elvanidi , Cinthya Marilu Benitez Reascos , Elissavet Gourzoulidou, Alexander Kunze , Johannes F.J. Max and Nikolaos Katsoulas.