Removing Efflorescence from Retaining Walls | Ep. 104
Powdery white stains on your retaining wall are likely caused by efflorescence. As concrete cures, moisture slowly migrates to the surface of the block where it evaporates into the air.
Water brings dissolved salts and minerals from within the concrete mixture. As the water evaporates, those minerals are left on the surface of your block, giving it a whitish, hazy, or streaky stain.
Here are some tips for dealing with efflorescence, along with much more, on the Today's Homeowner Podcast!