I just thought I'd forwarn anyone who buys DE from Lowes...it's not the edible kind. I noticed they were carrying it but upon reading the label...it's toxic to people and animals. So be sure to check the label before you buy it.
I get mine at the feed store, they put in their feed and let me buy one of their bags at cost. It's the safe stuff, I use it myself sometimes.
the stuff sold at lowes and other such places is usually for pools. pool DE has been treated with heat and its structure changes and becomes much "sharper." it is VERY harmful to any animal with lungs (including us!). food grade DE is safe - it has not been heat-treated. i'm so glad you read the package. most of the folks working at places like lowes etc. don't know the difference and will sell you the pool stuff unawares!