When I see bugs, I want them gone, period.Permetherin is much more potent than DE, so i dont doubt it resolved your problem rapidly. DE takes some time to work, and unless your mixing or tilling in an exorbitant amount of it into your dirt floor then your not touching the source really. DE works better as a preventative and as a spot treatment than as a way to stop an infestation.
Permetherin works totally differently than DE, and so dusting an area with it has a major impact. Its also a very harsh chemical. I strive not to use chemicals unless absolutely necessary.
-Kathy