Client has white/chalky brick; wants it restored back to its original brick color

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My customer has brick patio and walkway and is wondering why is it chalky/white. Has tried "washing it" off but it returns to its chalky appearance after it dries. I seen a video somewhere on the web about an inexperienced pressure washer that attempted to pressure wash brick but ruined it.
This is my first post and I uploaded a video, hopefully it can be viewed. Thanks!


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Chances are, that white chalky stuff is efflorescence (pronounced ef-luh-res-uh ns), an accumulation of minerals and salts on brick and cement.

Prevention

  • An impregnating hydrophobic sealant can be applied to a surface to prevent the intrusion of water. It will also prevent water from traveling to the surface from within. In cold climates, this sealant can cause material to break during freeze/thaw cycles.
  • During home construction, bricks left out overnight should be kept on palletes and be covered. Moisture from damp soil and rain can be absorbed into the brick.
Removal

  • Pressurized water can sometimes be used to remove or dissolve efflorescence.
  • An acid, such as diluted muriatic acid, can be used to dissolve efflorescence. Water should be applied first so that the acid does not discolor the brick itself. Following application, baking soda can be used to neutralize the acid and prevent any additional damage to the masonry. Muriatic acid is toxic, and contact with skin or eyes should be avoided.
  • A strong brush can be used.
Note: The use of water to remove efflorescence may result in the re-absorption of crystals into the host material, from which they may later reappear as more efflorescence. If water is used in the removal process, make sure it is dried off quickly.
http://activerain.com/blogsview/1935623/what-s-that-white-stuff-on-my-bricks-
 
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