Your HydroLogic Stealth RO200 is an amazing piece of technology that produces highly purified water, but it wastes some water in the process. By using the Eco-Waste reducer you can improve the product to waste water ratio and make an already great piece of equipment better. Plus you'll conserve water and save a little money. Not bad for a tiny piece of plastic. The HydroLogic Stealth RO200 Eco-Waste Reducer fits HydroLogic Stealth RO200 systems. Improves the product to waste ratio from 3:1 to 2:1. Saves water and money. Installs easily in minutes.