Ivan Krpan says on July 17, 2009 at 11:00 am:
Hey Mac, this is for you.
This is [about] the white powder that has the City of DeKalb so freaked out and spending extra dollars to eliminate. Basically, it’s a natural by product of being in the midwest and having to deal with winter, ice and snow, water, and salt. You can repost this anywhere you feel is appropriate.
A few words about efflorescence.
Efflorescence occurs when water soluble salts are carried to the surface by water which evaporates and leaves this powdery salt on the surface. The salts occur most often on concrete, brick, mortar and Mexican Saltillo tile. The salts may be released from within the material or even the soil. They do require water to be activated and water evaporation to be deposited on the surface. When they occur, it is desirable to allow the surface to dry thoroughly to halt the formation of the salts. After cleaning, the salts may reappear if the water conditions reoccur. Sealing the clean, dry surface will control and reduce the reappearance but may not completely stop the process.
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