"Poe Lim" wrote in message . au...
That's actually what I did, as well as do a search on Google, and phone
several hydroponics places (all had pre-mixed stuff)...

You might be able to order salpetre ( "saltpeter" in US English) in a pharmacy. Saltpetre
is plain just plain potassium nitrate. I got some that way.

I've also found another suggestion here :

http://www.recipegoldmine.com/sources/sources.html