How to remove magnesium coming throught the grout of tlies

the tiles are laid on the cement in the basement. Not sure if it is calcium or magnesium coming up where the grout is ? It is white in color. The color of the grout is chocolate brown.

  5 answers
  • Cindy Cindy on Dec 21, 2017
    Hi Sharon, If it's calcium deposits, vinegar will remove them.

  • William William on Dec 21, 2017
    Then seal the grout.

  • Flipturn Flipturn on Dec 21, 2017
    Where in Canada are you located? Do you have a high water table in your neighbourhood?

  • Sharon Sharon on Dec 21, 2017
    Its mineral salts either from the concrete under the tile and/or the mortar. Was the concrete floor sealed before you laid the tile? or have you had leaks in the basement? As long as moisture is present you will continue to have efforescence i.e. mineral salts.
    To get rid of use a brush to remove it and vacuum up. If this doesn't get rid of it, I would use vinegar and water as your acid to remove.....
    You might want to put a dehumidifier in the basement, and if it drys out and stops effloresing I would try sealing the grout in one area and see if it improves it..... if it does then do the rest of the floor.

  • Leah Leah on Dec 22, 2017
    Are you sure it is not white mold? Try bleach and see what happens. Then try the dehumidifier and a heater.