How much water should i put in the self-watering system? Clairy Support May 09, 2018 15:09 Follow You can fill the self-watering system until you see the white part of the float. Related articles How do I know when it's time to water the plant? What type of plants work best with NATEDE? What is the function of the strings? Should I use just one or both? Comments 0 comments Article is closed for comments.