What efflorescence is
Water dissolves salts inside brick and mortar, carries them to the surface, and evaporates, leaving the salt behind.
When it's a warning sign
Recurring efflorescence on a chimney, foundation, or one section of wall indicates a persistent water source that can lead to spalling and mortar loss.
How to remove it
Dry-brush first. For stubborn deposits, use a masonry-safe efflorescence cleaner. Avoid strong muriatic acid on older brick.
Frequently asked questions
Does sealing brick stop efflorescence?
Only after the water source is fixed. Sealing a wet wall can trap salts beneath the surface.
Is efflorescence the same as mold?
No. Efflorescence is crystalline and dissolves in water; mold is fuzzy and organic.
Is it normal on new brickwork?
Light 'new building bloom' is common in the first year and usually fades.
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