Those pictures sure get my excitement level going up about getting back into ponds and growing plants from the nitrate filled water. Your system looks perfectly simple and I love the idea of using a feeding trough as a grow bed. Really, really nice.
It looks like your bell siphon is inside a larger diameter pipe and I'm guessing the water rushes down inside that bigger pipe and then back up inside the siphon? Or do you have holes drilled in that larger pipe to let the water flow straight through it?
I need to take pictures of the siphon system I have here and see if it's very much different from your's.
