Delta Water Engineering, manufacturer of non-electric water softeners and member of the Pollet Water Group, presented the Delta Open Drain during the Aquatech show in Amsterdam. Delta won the innovation award for the development of the D.O.D. The D.O.D. is a small device that is installed in the drain pipe of the water softener and that prevents backflow from the drain to the softener. The D.O.D is equipped with a transparent cover to prevent water splash.