Coco coir that has been pre-treated with a calcium/magnesium solution to saturate its cation exchange sites, preventing the medium from stripping these elements from the nutrient solution during early use.
AutoPot's guidelines (read aloud by Dakota) specify using coco that is 'already buffered and stabilized.' If unsure, they recommend running 2.5 gallons of pH 5.6 water with quarter-strength feed through each pot to instantly stabilize the coco before the automated system is turned on.
Discussed in: Ep 001