chinchex sg is great. They are really effective and those bed bugs were gone within 2 weeks time based on my personal experience. I've also apply the powder in every 4 weeks, I think other insects are now starting to disappear too. I would recommend it to everyone who needs to get away from bed bugs and insects. its cheap, but effective. if you unsure how to apply the powder, chinchex sg has tutorial videos online for your reference.