That would be the Waterfarm, however it doesn't run on a water pump. It uses air. The ring is served by a tube, maybe 1/2" in width. The air is pushed down near the bottom of that tube pushing the water up. These are not maintenance free however. There's a point near the bottom that gets particles of the nutrients eventually blocking the air.. so no water gets pushed up because the air is blocked. It does generally last for one crop, but I wouldn't trust it a second time around unless it is 'descaled'.

keylime