It might be boric acid.
Tiny dirt piles coming in carpet.
I noticed this pile of.
The exact location of the dirt pile can also be an important clue as to the culprit.
If you look closely directly above the sawdust piles you may see the slits where carpenter ants push out their sawdust or you may see the round exit holes left by powderpost beetles.
Unfortunately if frass is kicked out of a termite burrow in the ceiling or some other place it can fall unto the floor wooden or carpet where it is unlikely to ever be detected.
As they leave the infested wood they push the sawdust out.
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Look for holes in clothes and fabric woven furniture to begin identifying these critters.
An insect repellent often added beneath carpet and inside walls to prevent cockroaches and ants.
However if the dirt appears to be coming out from within the window frame or from behind the baseboard you re likely looking at something more significant than just what the wind blew in.
Pretty scary what can be lurking under the carpet.
It s been happening now for a few days.
The powder can be white or yellow.
I take the tiny piles of black course dust and when removed it leaves what looks like a burn mark that is difficult to clean and take out of a nice box.
These are subterranean termites.
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I cleaned it up but by the next morning a new pile was being formed in the same place.
In the last few days lots of little piles of soil have appeared all over my block paving.
That looks like reddish brown sand had appeared on my floor the other day.
Carpet beetles like to live out of sight and feed on the natural fibers in fabrics even living off carpet fibers that are 90 percent synthetic.
You can see the termites crawling in the dirt areas.
It was about the size of a quarter.
After the larvae pupate and turn into adult beetles the adults bore tiny round exit holes in the wood.
Thanks for any further help.