Dear Judy:
Urine contains ureic acid and, like any other acid, will react with the calcite of your marble. The “water stains” that you have are in fact etch marks.
In other words, what you have are actual surface damages that need to be repaired.
You can opt for a professional stone restoration contractor, or, if the etch marks are not too many, you could consider using a good-quality marble re-polishing product like MB-11.
If you choose the latter, let me know how it worked out! :-)
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
:-)
Ciao and good luck,
Mauri
Article ID: 121
Created On: Wed, Jun 20, 2007 at 7:57 AM
Last Updated On: Wed, Jun 20, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=121