About 12 years ago I did my first and (@ time) only grow.I think the only 2 reasons they lived past the peat pellet stage was I kept them warm,non saturated,and the bagsead had some vigor.Planted outside,the soil brought the plants too harvest.Though little direct sun due to stealth,my knowledge limited to peat pellet/Liquid Miracle gro labels,the rich soil buffered my noobness.The harvest was just as good as the source smoke.
11 years later I did a diy dwc with more knowledge,and more gained as I went along.Once dialed in the dwc was still a pain in the bawlz .No tds meter,and just ph drops,the nothing to write home about genetics produced for me.
6 mo's later,better genetics,and forever in my garden is the passive hydro a la Hempy.My favorite traditional medium of choice is Hydroton.All things considered (proper enviroment/your fave complete hydro nutes,etc.),the important thing for me with Hempy is keeping the taproot moist and aerated till roots hit the res.Hempy original medium Perlite works,but I prefer Rockwool starter cubes for seed starting directly into Hydroton Hempy.Rooted clones go directly into Hempy cups with feeder roots resting on top of res.Once roots fill in it is a piece of cake to tilt to drain,pop out plant/root ball and place on top of res (bigger container with medium filled to bottom of hole) then fill around to support plant.Imho a Hempy will out yield soil,with both using the same size container.
I urge anyone interested in hydro simplified to Google:Hempy collective,Hempy for dummies,The official Hempy bucket thread.
Imho opinion Co Co Coir just complicates what the system all ready provides,and that is an aerated rootzone with a readily available source of H2O and nutrients.
Fellow Hempy Heads (except Co Co Heads) will concur.