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November 5 - November 11, 2012

Can efflorescence be removed from integrally colored CMU without damaging the appearance? How?

Selected Answers

From Andres Weber of Chemical Technology Inc. on November 15, 2012:
Phosphoric acid at a low concentration is a great way to solve this problem, too.

From Joseph Berchenko of Arcom on November 12, 2012:
     If CMU is new and there are no leaks or water sources, it may weather off by itself after a while.

From Glenn Summers of Conselcor Inc. on November 12, 2012:
     Yes, it may be removed, and any acidic material should be used sparingly since we don't want an acid to loosen the limestone bond to the fine aggregate. Once removed, a quality penetrating sealer will prevent it from returning.

From web stokes of DMA on November 7, 2012:
     Yes, with a mild acidic solution. Acetic acid works well.

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