Finally got rock for my tank!!

Wrench - the "store brand" or generic stuff you get at grocery stores or Walmart is usually the kind you want. Even then, make sure you read the label carefully, cos even the generic stuff might come in two kinds - scented as well as unscented.

Hope this helps,
Yash
 
Thanks again. I thought all of the ammonias on the shelves had additives. I was unaware that I could get 100% pure.
 
AquariaCentral.com