Replaces standard Stealth RO 100 & Stealth RO 200 flow restrictors to save 50% of the drain water. Gives a 1:1 ratio. This product reduces waste water and can lead to a reduction in membrane life. The higher your source water's Parts Per Million (ppm) are, the shorter yourmembrane life will be. Not reccomended if source water is above 300 Parts Per Million.