DE is best used as part of an integrated strategy — sealing, cleaning, trapping + DE dusting. Relying on it alone rarely secures long-term control.
Don’t forget safety: even though it’s “natural”, inhaling fine DE dust isn’t harmless. Use a mask, especially in indoor application.
I tested DE vs ants outdoors, after rain it needed re-application. So yes, it works initially, but long-term means maintenance too.
Use sticky traps or monitor points after applying DE. If pest numbers don’t drop or new signs appear, then the dusting alone wasn’t enough.
For outdoor perimeter use, DE can remain effective until disturbed or watered. Indoors though — foot traffic, vacuuming, air flow can reduce its lifespan.
Yes it can work for long-term prevention, but not magically. Consistent applications, dry conditions, correct placement, they all matter.