I have seen coco used but not in a drip. I would think it would stay too wet or hard to adjust the timing on the drip.

I would go hydrotron and the fine is so small sometimes it falls through the net pots. Must be why most use medium size but it's all the same. We are back to running 24/7 drip and doing well.
LOC NAR on probation Reviewed by LOC NAR on probation on . coco or hydro....that is the question I am setting up another dwc/top drip tub for my 3rd attempt........trying to decide between filling my 3" net pots with coco coir or hydroton.......anyone want to share there opinions, and as far as the hydroton goes, most everyone seems to have the medium grade, but has anyone tried the fine grade......any pros cons to one of these 3 options over the other would be appreciated. Rating: 5