If you own a HydroLogic Stealth RO100 you may appreciate the water savings you'll get from using the Eco-Waste reducer. RO systems are great, but they waste water in the purifying process. The Eco-Waste reducer improves the product to waste water ratio so you can conserve water and save a little money. The HydroLogic Stealth RO100 Eco-Waste Reducer fits HydroLogic Stealth RO100 RO systems. Improves the product to waste ratio from 3:1 to 2:1. Saves water and money. Installs easily in minutes.