Effective Mold Protection: Many users, including those with severe mold issues, reported significant improvement after using Grout-Guard. One reviewer mentioned clearing out all mold in their bathroom after switching to this product.

Easy to Use: The additive blends seamlessly into wet grout during mixing. Users appreciated the simplicity of kneading the package and adding it to their grout mixture.

Color Considerations: While effective with white grout, some users noted that the bright white zinc oxide main ingredient may not be ideal for dark-colored grouts.

Temporary Solution: The product provides mold resistance for several years but won't last forever. It's seen as an affordable way to extend grout life between replacements.

Versatile Applications: Some creative users have experimented with using the additive in caulks and even around window seals to prevent mold growth in other areas.

Non-Toxic Formula: Made in the USA with a non-toxic solution, it keeps tiles looking new without harsh chemicals.