Replacing grout is certainly one way to fix the problem. Instead, use UltraCare Grout Refresh, a water-based colorant and sealer that is available in MAPEI’s full palette of grout colors. UltraCare Grout Refresh is made for refreshing the look of old, discolored grout or completely changing the color of the existing grout. Don’t replace it, Grout Refresh it! To learn more, watch the video below.

Anyone with basic painting skills can use UltraCare Grout Refresh. The UltraCare Grout Refresh bottle has a cone-shaped applicator tip that easily directs the sealant to the grout joint. All it takes is a toothbrush or similar nylon brush to spread UltraCare Grout Refresh over the grout, and a bucket of clean water and a clean, damp sponge to remove the excess. To learn more, watch the video below.

Products identified with MAPEI's BioBlock logo have been developed in such a way that they do not support mold/mildew/fungi growth after product installation, as certified by external laboratories per industry standard ASTM G21: Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi. Common cleaning and maintenance practices are still needed.

Since the introduction of the BioBlock logo in 2003, MAPEI has continued to develop and expand the range and depth of products that include this technology. The list of MAPEI products that carry the BioBlock logo is evolving with the technology and is constantly growing. Look for these innovative products across the following categories: Liquid membranes, adhesives, sealants, caulks, mortars, grouts and finishes.

For homeowners and building owners, the advantage is after installation. MAPEI’s BioBlock products will not support the growth of mold/mildew/fungi – with adequate cleaning and maintenance practices.

The advantage for contractors and installers is that MAPEI’s BioBlock products do not support the growth of mold/mildew/fungi – with adequate cleaning and maintenance. Therefore, their use can increase the life of an installation, resulting in fewer callbacks for installers and contractors.

ASTM G21 is an industry standard that uses an intensive testing protocol for determining if fungi, including mold and mildew, can grow on a polymeric material. MAPEI uses a third-party lab and the ASTM G21 standard for testing the antifungal effectiveness of MAPEI products containing polymer that incorporate BioBlock technology. The ASTM G21 test uses a mix of mold and mildew spores that are commonly found in household environments. Product samples are placed on nutrient-containing plates and sprayed with a mixture of these fungi. For 28 days, the test plates are kept at a constant temperature of 84.2°F (29°C) and exposed to high humidity, which are excellent conditions for fungal growth. The samples are then examined for fungal growth. If no growth is present, the product is considered to not support mold/mildew/fungal growth.