i bought this product after reading the reviews on how it kills the bed bugs. i thought i need the 3 pound DE, because i wanted to apply it to my entire apartment. But i used one third of it and applied for entire aprtment each corner and all the walls and doors, under the BED, Bed frams, Cup boards, under the carpets, and also applied in my sofas.... it has been three weeks i bought the Product. I started sleeping on my BED again from the Next day after i applied it. No BUG Bites at all. I do inspect every day and they are long gone. i do a see a couple still struggling to come to my BED. but i kill them before even they reach. i cleaned the entire house after 2 weeks of applying it. and re apllied again... since i got the feeling that... this powder last it's power. this 3 pound pack comes for months and months and very reliable, unlike the sprays, which i used first, and just finshes in an hour or so. i hope it's available in walmart... i had to pay for shipping, which i hate to pay.
P.S. - Do not throw away your beds / sofas. this one works.
Update: i did second round of this product after 2 months of first application and kept it for about a month. then i cleaned my entire apartment. now it has been more than a month.... i do not see any sign of bed bug or any kind of bug. very effective.