POTENTIAL CAUSES OF THE PROBLEM

a) Poor quality grout
b) Incorrect application
c) Possible moisture behind the tile

SOLUTION

Step 1: With a metal spatula remove the loose particles of the problematic tile grout

Step 2: Clean the surface from dust thoroughly. Light cleaning with water is suggested

Step 3: The mix is prepared, having chosen one of THRAKON’s FMF 160 tile grouts and applied with a rubber spatula

Step 4: Once tile grout has dried, clean the surface with a sponge

Step 5: Clean the area further with a damp clothe