Its a ten gallon recirculating system currently holding two 60 day old bell pepper plants. The tray has a 3D printed bell siphon with about a 15 minute fill/empty cycle that changes the water level by 1.5 inches.
The peppers have much larger leaves than those growing in our tower, and there are no insects eating holes in the leaves as did those in backyard milk bottles. There is some red algae growing inside the sunlight exposed nutrient recirculating tubes. Next winter I’ll use black vinyl.
No sign of blossoms yet. We have hope.