In an Autopot system, nutrients are released to the plant/s via a gravity fed valve(AQUAvalve). Only when the entire amount of nutrient solution has been used does the valve release more nutrient. Through this system the plant is determining its own feed rates, and as a result there is no waste. The Autopot system is a bottom feed system that requires no power supply, timers or mains water supply, so can be left unattended for long periods.