The WaterFarm is a simple quality system that is great for longer term plants and trees. The kit includes a 12 litre reservoir, grow tray, air pump, pumping kit and illustrated easy to follow instructions. This kit comes with a Hailea ACO2201 Pump. The WaterFarm consists of a small air pump that recirculates the nutrient via a drip ring. The plants sit in the Clay Pebbles or a mixture of Clay Pebbles and Coco Coir. An external see-through tube lets you know when more nutrient is needed. This system uses one pot above the other and the solution is recirculated via a pump and circular dripper around the base of the plant.