The question, I guess, is how much air to the roots is sufficient. Just like humans, just because we are walking around in the open air with unlimited access, doesn't mean we use more of it.
I think it's the combination of sufficient and constant availability of both water/nutrients and air to the lower roots that is the true secret of all of these bottom watering systems like SIP and SWICK.
SWICKs grown using cloth pots with much more access to available air to the roots don't grow bigger plants than SIPs which leads me to the conclusion that, beyond a certain point, availability to more air doesn't matter all that much.
I think it's the combination of sufficient and constant availability of both water/nutrients and air to the lower roots that is the true secret of all of these bottom watering systems like SIP and SWICK.
SWICKs grown using cloth pots with much more access to available air to the roots don't grow bigger plants than SIPs which leads me to the conclusion that, beyond a certain point, availability to more air doesn't matter all that much.