Water purity for masonry conservation

I would like to find information about water purity requirements for
a masonry conservation project.  There appear to be several articles
and past ConsDist postings on this topic for paper conservation, but
nothing in building conservation.  I have read a few conservation
articles that specify the need to use potable water, but that
deionized water is preferred.  Does anyone have more specific
recommendations for water quality in a masonry conservation regimen?

Jennifer Cappeto
Architectural Conservator
Jablonski-Berkowitz Conservation
40 West 27th Street, Suite 1201
New York, NY 10001


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                  Conservation DistList Instance 17:11
                  Distributed: Tuesday, July 15, 2003
                       Message Id: cdl-17-11-031
                                  ***