ICMag with help from Landrace Warden and The Vault is running a NEW contest in November! You can check it here.
Prizes are seeds & forum premium access. Come join in!
coco coir is inert and is therefore considered a medium suited for hydroponic applications, or it can be mixed with soil for improved aeration similar to pearlite, vermiculite, hydroton, etc.
fieldgrower is using a flood and drain style hydro( i think) table, which would be able to take advantage of coir's ability to retain high oxygen levels (attained from the negative pressure of water penetrating the coir frequently) as well as timed waterings keep a level ppms/ph.
There are many advantages of using coir chunks / slabs/ in ebb and flow systems compared to rockwool or hydroton. I wont go into crazy detail but there's a reason that an entire sections of the IC forums is dedicated to growing in coir.