[Gerardo]

Originally Posted by Worth1

Vermiculite got a bad rap from a Montana mine that was also contaminated with asbestos.
https://en.wikipedia.org/wiki/Vermic...r_health_risks

This mine has been shut down but too late for one of my friends that worked there.
Here is what the CDC says about perlite.
https://www.google.com/url?sa=t&rct=...BQsiBJXssYCiYQ

I may not wear a dust mask but I stay up wind of things that give off dust.

Worth

I bought a big bag of perlite (aztec, a company out of Escondido) and even though it's pretty coarse, the fine dust is everywhere almost instantaneously. A simple N95 from 3M works just fine and I breathe in with no fear--they don't intrude too badly. The duckbill type rock too.

PS They also help when adding the powders to my mix, alfalfa, crab, bone meals, tomato tone, etc. Otherwise, those fishy-tomato tone boogers are not pleasant.