i love coco! I buy 4.5 cf blocks of Down to Earth for $20. I mix with perlite at 9/1 (coco/perlite). I grow "hempy" style, using a 3.5 gal bucket i leave 1" perlite at the bottom, and cut 1 hole 2" from the bottom, thus leaving a "res" in the bucket.
Using Blumats, I water to waste without output, using clearex/dripclean i don't have to worry about salt buildup.
3.5 gal buckets
9/1 coir/perlite
bc nutes(org for veg, chem for bloom), clearex/dripclean, humic/fulvic acid, superthrive(for veg), cal/mag.
I will never go back to soil and it's issues. With proper flushing/conditioning, coir can be reused many, many times.