A Garden Irrigation Controller is a device that attaches to your hose and meters the amount of water going out onto your garden. This is a great way to save money on your water bill and reduce waste by not overwatering or underwatering your plants.
There are many types of irrigation controllers available, typically designed for either indoor or outdoor use. In order to get the most use of your controller, you should mount it outside where the hose is accessible and can be plugged in.
The amount of water going out onto your garden is determined by a dial or slider on the front of the irrigation controller. This controls how much water passes through a small opening in a diverter inside of the controller. All of the water then flows out through a hose or drip line into your garden. One thing to keep in mind is that many irrigation controllers have a timer on them as well.