Gritty mix ingredient?
I have followed the gritty mix discussion with interest but since I live in a small town that doesn't even have a garden center, finding the ingredients might be next to impossible.
But I did find a product called Zeolite. It is a soil conditioner made of 100% crushed volcanic rock. Could that be used as a substitute for one of the ingredients? It is quite fine in texture, smaller than a grain of rice.
I am in northern Canada, btw.