We may receive a commission on purchases made from links. If you've noticed a white, powdery substance on a surface in your home, you may accidentally mistake it for mold at first. However, upon ...

Q: I have noticed a white powder around the edges of my concrete walkway. Should I be concerned? A: The white powder is the result of efflorescence, which occurs when a soluble salt, such as earth, ...

Efflorescence is the white powdery substance you might notice on basement walls, concrete surfaces, or masonry materials. It forms when water moves through a porous material like concrete or brick, ...

1.The floor of my basement is spotted with efflorescence. What is causing this, and how can it be removed? There has never been water on the floor. I run a dehumidifier in the summer when the basement ...