I think its about 22-24". I didn't sink rocks down in it when I set it up (rushed and not thinking), so I had to rig some covered wire things into 'baskets' with hooks to hang the two pots from the sides. Thought for sure something like that would exist, but searched and couldn't find anything. The solution I have is really clunky and threatening to dump the pots down into the water at any moment! The floaty rings take up too much room to have more than 1 in there. It amazes me how often I have to add water to it. It takes over a gallon maybe twice a week, to keep it at its current level.
