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  1. I

    Is this grout efflorescence? What to do?

    Many thanks. I'm color blind, would you say it's a gray color?
  2. I

    Is this grout efflorescence? What to do?

    Thanks, any suggestions on what grout to use to repair the tiles? Or does it not really matter?
  3. I

    Is this grout efflorescence? What to do?

    Hi guys, I'm seeing this white stuff pushing out of (and sometimes actually pushing out) the grout in the tiles that separate my spa from the pool. I don't see this happening anywhere else in the pool. It's very hard and not easy to scrape, suggesting it's not salt. Any ideas what to do? What...