I have wanted to wait 12 months before writing this review to be double sure the product works. Our daughter brought bed bugs home from an overseas trip to the US early last year and by the time we realised it, they had multiplied quite a lot in her room. We ordered the mattress covers and the powder. We also steamed the bed slats, mattress and carpet (I already had a steam cleaner). Then we coated everything in powder (I may have gone slightly overboard). We found some stray bugs probably 3 weeks in and re-applied the powder. From then on we had no further issues.