Normally, the very top of the bowl is above the water. The water level needs to be right at the neck of the bowl to cause the proper "ferris wheel" motion.
I have heard of people trying to completely submerge the bowl with netting over the top but I don't remember seeing any success stories for that. Anyone here tried it?
I have heard of people trying to completely submerge the bowl with netting over the top but I don't remember seeing any success stories for that. Anyone here tried it?