While shopping yesterday I came across 10 kg bags of Zeolite for $6 so I picked up a bag on impulse (and knowing nothing about it). My initial thought was that I would use it as a mulch in troughs (which I don't have just yet, but have plans to try making some hypertufa ones soon - bought a giant sized bag of vermiculite as well).
After I got home I started reading about it. Am I correct in understanding that Zeolite actually holds moisture? Will it be better served as a soil additive for the troughs, rather than a mulch? If as a soil additive, how much would one use, say for a wheelbarrow full of soil mix?