What Causes Limestone Efflorescence
Limestone is itself a calcium carbonate-rich stone, and when water moves through it and evaporates at the surface, it can leave behind a white, hazy mineral deposit called efflorescence — a related but distinct phenomenon from pool tile calcium scale.
Why It's Different From Simple Dirt or Staining
Efflorescence comes from within the stone itself rather than sitting on top as surface grime, which means it can reappear even after cleaning if moisture continues moving through the material — ongoing drainage management matters as much as the cleaning itself.
Treatment Approach
Removing limestone efflorescence requires a stone-safe approach that addresses the surface deposit without using acids strong enough to etch the calcium-based stone itself, paired with an assessment of moisture sources contributing to recurring efflorescence.