I now have 100# of DE. One lifetime supply? or more? I asked DH to buy some at the feed store. He bought a 50# bag, Celatom diatomite, from Reno, for ~$25 I didn't think it was the 'good' kind so I ordered a 50# bag from AzureStandard (just started with them...LOVE 'em) for $17... it is the Same bag. If anyone in Sonoma County needs some let me know.