#$%^&*AU2012100312A420120419.pdf#####ABSTRACT A dosing device for a hydroponic growing system, including a primary chamber for storing a volume of solution, a secondary chamber of a set volume for holding a measured amount of said solution, a first gate between the primary and secondary chambers and a second gate from the 5 secondary chamber. The first gate is openable to release solution from the primary chamber into the secondary chamber, whereby when the secondary chamber is full the first gate is closed and a measured amount of solution is contained in the secondary chamber, the second gate being openable to release a measured amount of solution from the secondary chamber.Fric~cJ