What method is used to optimize bond and minimize grout contamination during installation?

The method that optimizes bond and minimizes grout contamination during installation is acid washing. Acid washing is used to clean the surface of the substrate effectively by removing any contaminants, such as dust, grease, or old adhesive residues, that can interfere with the adhesion of the tile and grout.

The acidity of the solution breaks down these impurities, ensuring that the surface is not only clean but also has a suitable texture for improved bonding. Once this process is complete, it is crucial to rinse the area thoroughly with water to neutralize the acid and remove any remaining residues, making it ready for tile installation. In this way, using acid washing as a preparation step enhances the longevity and effectiveness of the bond between the tile and the substrate, while also preventing issues related to contaminated grout.

Other methods like dry grinding, pressure washing, and sandblasting may clean surfaces but can potentially leave residue, cause surface damage, or not sufficiently prepare the substrate for optimal adhesion, which is why they are not suitable in this context.