I went through a nasty infestation earlier this spring. ( I brought my boa to Reptile Fest in Chicago IL for exhibition and somewhere along the weekend he got mites and I brought him home therefore spreading them to everyone! I used Provent A Mite ( pam ) worked good after two treatments. I now take a proactive approach and pre treat all their cage BEFORE they get mites! My suggestion is to treat all your snakes weather you see the mites or not. this will guarantee that you kill the infestation. Im not sure whats available in Canada though??