From what I can gather some coco`s are unbuffered so need the buffering agent added (I think this is the same as the wetting agent) to be able to take up nutrients properly. Others are prebuffered. Some manufacturers recommend coco specific tailored nutrients, others claim any liquid feed can be used.
plagron
canna-uk.com/coco
Can`t find that post Stoneric- maybe it has been deleted but part of it is quoted
Quote:
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for the final pot-up (somewhere around pre/flowering) we'd use mostly coco as it will allow for better exchange of P & K. you get to use less bloom ferts & you're essentially flushing your salt buildups everytime you water. just gotta water more often than humus builds..
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I have some questions also. Apparently you can recirculate from drainage or drain to waste. I suppose for best results you`d want to monitor pH and Ec, also you`d probably want to aerate with an air stone and control the temp? Or if you were going with drain to waste could you essentially use the same methods as watering soil?