Bottom-fed (AKA gravity-fed) systems are a great way to automate the feeding of soil or coco grown plants with the absolute minimum of hassle. These systems provide a very economical solution; they're also quick and easy to set up, and they're highly effective. Hydroponics has never been so easy! Once set up, gravity-fed systems keep plants fed and watered automatically using float valves - no pumping equipment required. All you have to do is top up / change-out the reservoir from time to time. Simple!