This kit allows you to bypass the flow restrictor and "power flush" the membrane(s) to remove scale build-up and organic and inorganic contaminants from the membrane surface. By flushing the membrane(s) regularly you can help extend the life of the membrane(s). Ideally, you want to flush the membrane(s) for 3-5 minutes directly after every time you use the Reverse Osmosis unit. Part Number: HL# 26040