The IWS Timer unit controls the feeding schedules of the system by activating the pumps within the reservoir and Brain Pot to Flood OR Drain the growing sites in the complete system. featuring a Grasslin segmental timer unit which sets the time of the day you require to feed your plants, this timer then initiates a second timer in the unit which is minute adjustable for precission timings this controls how long you want to initiate a flooded state of your plants.