When the supply of calcium hydroxide is exhausted. If you live in an area of frequent rain and sunny days, efflorescence and its passing may occur quickly. The process may take much longer in drier climates. Typically, efflorescence will stop developing in approximately 18 to 24 months.
Will it go away naturally?
Since many factors are involved in its formation, it is difficult to determine when efflorescence will stop. Just as it appears naturally, efflorescence will eventually disappear. Over time, rainwater can wash and wear it away. In urban areas with acidic rainfall, efflorescence may go away faster than in rural areas.
Can it be Removed Without The wait?
Yes, efflorescence may be cleaned with commerically available cleaners formulated specifically for concrete pavers. Cleaning should be performed immediately after efflorescence has appeared. It may reappear as long as the chemical reaction continues and cleaning may need to be done until efflorescence has stopped. Most cleaners contain acid and detergents, so be sure to follow all label directions and environmental regulations. Careless or improper cleaning can result in injury, damage, and discoloration to the surface of the concrete pavers. Always conduct a test in a small, inconspicuous area before applying any cleaner to the entire area of concrete pavers. After cleaning, the pavers should be completely dry and free from efflorescence prior to applying any sealers. For more information on efflorescence contact your nearest member, or visit our website to request: ICPI Tech Spec 5, Cleaning and Sealing Interlocking Concrete Pavement–A Maintenance and Protection Guide.
For f urther information on concrete pavers, installation, and contractors, contact your local ICPI member supplier.
When will efflorescence stop?