Efflorescence RemovalEfflorescence on Stone

Efflorescence is a white crystalline deposit that is composed of salts, lime and/or other minerals. These deposits may become visible on many types of building product surfaces such as concrete, stucco, grout, masonry, brick, natural stone, clay, ceramic and even wood. These salts and minerals are water-soluble and generally come from the ground or where cementitious or alkali substances exist. These salts and minerals travel to the surface, using moisture as their carrier, where exposure to air evaporates the moisture leaving behind salts and minerals on the surface.

Test in an inconspicuous area to determine if the desired results are achieved. Follow all label instructions as well as the instructions detailed below.

For efflorescence removal on non acid-sensitive surface such as most granite, slate, clay pavers, clay brick, and sandstone, etc.:

Efflorescence is acid-sensitive. Lime, salts and mineral deposits will usually dissolve when in contact with acidic liquids. Since efflorescence is sensitive to acid, StoneTech Professional™ Restore™, a strong but safe acidic cleaner, works well in dissolving and removing the substance in most instances. Follow the application instructions below:

  1. Mask off and protect any surrounding areas that will not be treated.
  2. Apply mixed solution at the light duty dilution level as listed on the product label, mix stronger if needed.
  3. Apply to the surface using clean mop, towel, sponge, or sprayer.
  4. Agitate with a stiff white nylon scrub brush, white nylon pad, or appropriate floor machine.
  5. Rinse area with a lightly dampened clean mop, sponge, towel or wet vacuum. Do not over apply rinse water. Moisture is one of the key factors in the development of efflorescence. Rinse well enough to remove any cleaner residues only. DO NOT OVERWET.
  6. Allow the surface to completely dry to determine the desired results.
  7. Sealing the surface using a StoneTech Professional™ impregnating sealer such as Bullet Proof, Stone Sealer, Heavy Duty Exterior Sealer or Grout Sealer will greatly minimize or eliminate efflorescence from recurring.
  8. If there is a continuous moisture problem beneath the surface, the efflorescence will probably still occur.

For efflorescence removal on acid sensitive surfaces such as most marble, limestone, travertine, masonry brick, concrete and stucco, etc.:

Restore™ is an acid based product which when applied to acid-sensitive surfaces will react with the surface and may alter its appearance. If an acid-sensitive surface is already textured, this may not cause a problem that is noticeable. If this is the case, you may follow the efflorescence removal process detailed above.

To remove efflorescence from acid-sensitive surfaces follow these application instructions:

  1. On flat surfaces you can sometimes remove the efflorescence using agitation by using a white nylon pad, dry. Agitate using a hand applicator or rotary sander with the white nylon pad attached. Often the lime, salts and minerals will come off with just this process.
  2. If this process does not completely remove the efflorescence, and on textured surfaces where the above step is not possible, additional treatment is required. Use StoneTech Professional™ Polishing Powder for polished surfaces or StoneTech Professional™ Honing Powder for unpolished surfaces. These are strong/coarse abrasives so test before using to see the effect on the surface’s finish.
  3. Mask off and protect any surrounding areas that will not be treated.
  4. Apply the abrasive powder to the contaminated surface.
  5. Add water until you achieve a milk-like consistency.
  6. Agitate with a stiff white nylon scrub brush, white nylon pad, or appropriate floor machine.
  7. Rinse area with a lightly dampened clean mop, sponge, towel or wet vacuum. Do not over apply rinse water. Moisture is one of the key factors in the development of efflorescence. Rinse well enough to remove any cleaner residues only. DO NOT OVERWET.
  8. Allow the surface to dry completely to determine the effectiveness of the process. Repeat if necessary.
  9. Sealing the surface using a StoneTech Professional™ impregnating sealer such as Bullet Proof, Stone Sealer, Heavy Duty Exterior Sealer or Grout Sealer will greatly minimize or eliminate efflorescence from recurring.
  10. If there is a continuous moisture problem beneath the surface, the efflorescence will probably still occur.

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