They work but the odor is really strong. They're supposed to be stored in a cool dry place when not in use - I have the sealed refill containers stored in a sealed plastic bag and the smell still gags me. I'm tempted to store them out in my garden shed, but it's hot outside and they're supposed to be kept cool. If I can't find a way to seal them up so I don't have to smell them in the house, I'm going to have to get rid of them...