Measure the space between the tiles.
Replacing tile grout in shower.
If the space is larger than 1 8 of an inch use a sanded grout.
Step 3 clean the seams.
Use a spray bottle and some cold water to wet the areas where you removed the grout.
Never use sanded grout with metal glass or marble tiles.
Step 2 remove loose and damaged grout.
Be careful to avoid damaging the tiles.
Gently run the grout saw back and forth along the grout seams.
When that day comes remove the grout and replace it to rejuvenate the installation and make the surface gleam.
If the width is 1 8 of an inch or smaller use an unsanded grout.
My house is only 2 years old and i already have some.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.