Removing Efflorescence from Grout

• Give the installation plenty of time to dry and the concrete to cure. Remove the white powder during this drying time by brushing.

• When new white powder stops developing clean the grout with a tile and grout cleaner to remove the stains.

• If necessary clean with diluted sulfuric or phosphoric acid. (Sulfuric is normally the preferred acid.) Dilution ratio a minimum of 5:1 to 7:1.

• Wet the surface prior to applying the acid.

• After applying the acid, wash the tile thoroughly to remove the acid residue.

• Do not allow the acid to get on anything including carpet and other floor covering products as it can cause severe damage.

When working with chemicals always follow the manufacturer recommendations and good safety practices. Do not allow the acid to come into contact with your skin, eyes or clothing.