Efflorescence: What Homeowners Should Know

If you’ve ever noticed a white, chalky substance on your basement walls, you’re not alone. It’s called efflorescence—and while it’s not dangerous, it can be a red flag. What Is Efflorescence? Efflorescence is a deposit of salt crystals that appear when water seeps through concrete or masonry and evaporates, leaving minerals behind. It looks like white powder or even fluffy deposits on walls or floors. What Causes It?

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