Calcium Deposits Despite Excellent CSI


Mod Squad
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
I see efflorescence which is caused by moisture behind the tile grout pushing calcium to the forefront. A different problem than what you expected.

Try some dilute 3:1 Water to Muriatic acid and see if that works to help scrub it off.

Maddie :flower:


Gold Supporter
Bronze Supporter
Jul 28, 2019
Denison , tx
Thanks Maddie ... previously I used straight MA in a spray bottle and it fizzed right off but I guess the diluted solution would be easier on the stone/mortar and safer ? 😉Do you know what I need to do to prevent it ... or is it even possible ?