The Automatic Watering System

When the level of the water in the Earth box is below the bottom of the white tube in the fill tube, air returns to the top of the bucket through the white hose from the bottom of the fill tube to allow more water to flow out of the bucket. Water then flows through the hose from the bottom of the five gallon bucket to the bottom of the Earth Box until it covers the bottom of the white hose again. The level of the water in the bottom of the Earth Box is adjusted by the level of the bottom of the white hose.