Clinoptilolite is the most common. I stumbled on a kitty litter that is about $7-10 per 25lb bag and it is Clinoptilotite which is the high Si variant of Clinoptilolite.
I count it as aeration, N regulation and a possible source of P, Ca and Si...... There is quite a bit of good study showing it as a benefit.
I count it as aeration, N regulation and a possible source of P, Ca and Si...... There is quite a bit of good study showing it as a benefit.