Ultimately, efflorescence itself isn't dangerous. However, it can lead to potential moisture problems that can cause structural damage to building materials. That means if you find efflorescence in the basement or on concrete and other structures, it's important to take action.
Do I need to remove efflorescence?
Surface efflorescence on brickwork is unsightly but easily remedied. There are three ways to remove efflorescence from brick, block, concrete, or pavers. The best time for removing efflorescence is when the weather is warm and dry. On some smooth surfaces, you may be able to use a stiff brush.
Does efflorescence go away on its own?
In many cases, efflorescence will disappear on its own over time (usually after the first year of a paver or retaining wall installation). Efflorescence can also be removed with special cleaners like the Gator Efflorescence Cleaner. On average, you should wait about 60 days before applying an efflorescence cleaner.