I bought some of this a few years ago when I bought my first pigs. They came completely infested with lice. I'm very against chemicals but I wasn't about to DE a couple pigs twice a day for month(s). I mixed the ratio to water according to label in a 5 gal bucket, and while the pigs were eating, I just dumped half a bucket per pig from base of skull to tail. I repeated again 14 days later and have not seen a bug on them since (~five years)

This product has a good initial effect, but it seems to be short lived. I find that I must retreat every 10 days or so to keep the fly levels down. If they added so kind of oil base to the product it may last longer and become more useful.