Blumats, gravity fed and a ceramic "Carrot" that uses capillary action based on moisture to open and close a valve to a drip line which delivers water slowly. The coco stays constantly moist but not soaking wet. You use a lower nutrient solution EC than typical as it's a constant feed system.
I don't have any recent pictures as I've been doing other types of growing these days but I'm doing another run the same way here real shortly. These are from a couple years ago. I've posted them before in other threads.
Blumats, fabric pots, and coco setup.
Results
Reservoir filled as needed.