You need to install this on your container. You also need to put a shut off valve near the end of your line from your RODI unit so that you can remove the line without spilling water when your container is full.
I didn't trust the float valve alone so I bought a garden hose timer at Lowes. I converted the garden hose to 1/4" on both ends. It has several different ways to program it. You can program it to only run for a set amount of time or come on every day or every few days and run for a set amount of time. If I remember correctly, it was under $20.