We never had bed bugs before but after a guest used our spare bedroom and was bitten all over, we had our first case. We didn’t want to use poisonous chemicals and came across Bed Bug Barrier. A bit suspicious as to whether it would work, we used the powder and other products, closed the door and checked again the next day. Lots of bugs and spiders, all dead. We had our next guest in the room a few weeks later and no problem whatsoever. Great result!