Quote Originally Posted by bigtopsfinn
Where'd you get it? Is it something from a hydro store, or just like home depot/walmart?
Yes. Any garden supply should have them. $5.

I put a one inch layer of vermiculite close to the bottom of my pots. It holds moisture and nute solution a little longer...so I need to know when that's gone. I water...water...water & nute...according to the meter. Works for me.