Urban Green Farms, Flood and Drain trays are designed for hydroponics and aquaponics. The planting tray is regularly flooded with hydroponic or aquaponic nutrient-enriched water. The growing media soaks up this solution, then the excess solution drains out and air is drawn down around the plant roots. Flooding and draining is done with the aid of a pump and a timer, which is easy to do at home.
 
This is an incredibly sustainable way to grow food and save water. Urban Green Farms is a Melbourne based company that promises to deliver sustainability to every Australian.