When growing in a Grobo Premium or Solid unit, drain and fills are required weekly. 


Top-ups are also required in germination, transition, flower and flush. We want to use the fill function to top-up the water tank 3 days after your drain and fill.



StageWater Requirement
Germination

Fill: 8L or 2.2 Gallon
[Top Water Level Sensor]


Top-up: 100-200ml


Early Vegetation 

Drain & Fill: 7L or 1.85 Gallon


During this stage, we lower the water level to the middle sensor to fight damping-off. We also turn on the bottom intake fan to help dry out the top of the coco pod. 


Check out this article on damping off: 

Help! I think my plant has damping off


Late Vegetation 

Drain & Fill: 8L or 2.2 Gallon


[Top Water Level Sensor]


Transition

Drain & Fill: 8L or 2.2 Gallon
[Top Water Level Sensor]


Top-up: Varies based on plant size 100ml to 4L or 1.1 gallon+


Flower

Drain & Fill: 8L or 2.2 Gallon
[Top Water Level Sensor]


Top-up: Varies based on plant size 100ml to 4L or 1.1 gallon+


Flush

Drain & Fill: 8L or 2.2 Gallon
[Top Water Level Sensor]


During this stage, Drain and refill on day 1 so any nutrients in the reservoir are removed. The unit will not dose bottles 3,4,5 in the Flush stage as your plant is forced to use nutrients in the leaves.


Top-up: Varies based on plant size