Not sure if you'll catch my edit about the calcinced clay in my last post, but I wanted to expand on it a bit anyway. I love the floor dry, but I don't want a bunch of white rocks in my media when/if I need to dispose of it in my veggie garden (not a problem for you, but for others this may be a consideration). This is part of what lead me to start adding coco chips to my mix. It's a little early to have formed a concrete opinion on them, but from what i've seen so far i'll likely be phasing out the floor dry completely in favor of the chips. I like them better because the roots can grow right through them, instead of around them. This increases the amount of usable media vs adding floor dry, while still adding excellent drainage and aeration properties. They are also strong enough to help prevent compaction.