The grower sets the frequency and duration of the feeds.

At the set times nutrient solution is pumped from the brain to each of the pots where it drips into the top of the pots.  The excess drains through the media into the catchment trays below the pots to prevent waterlogging. At the end of the feed duration, nutrient solution in the catchment trays drains back to the brain and is pumped to waste when the float trigger is reached.