Just north of Reno is a volcanic ash deposit of pozzolan. It is being mined and burned in a kiln for use as a soil and concrete additive. The main product is called Lassenite, and is used on golf courses to retain moisture.
I asked if they could make a product similar to hydroton or prime agra, and they already do! Made in the USA.
It's named "Higromite".
Has anyone used this?
What were the results?