I'll have to give only 3 stars as I have applied Kaput through-out my yard loading both the tunnels and, when I can locate, the "den." I have applied with a Gopher probe (needed) multiple times and still see new mounds just a foot or so from where I applied. I've read it takes a couple of weeks to work, I believe I've applied about 10 days ago. We shall see. I have been researching other poison however living in California choices are limited due to restrictions. If I see better results I will update.