How to Acid Wash a Slate Tile Floor

Mix ¾ cup of sulfamic acid crystal with a bucket of water. Industry standard tile-cleaning-strength crystals are available at home and garden centers.

Spray water on small sections of the tile floor using a spray bottle. Apply the sulfamic acid solution to the wet area with a sponge and scrub gently. Allow the acid to soak for two to three minutes.

Rinse the area well using a clean, damp towel. Continue the process over the entire tiled floor. Keep the area you are working on wet.

Mix one cup baking soda with a bucket of warm water. Mop the entire floor with the mixture to neutralize the acid. Rinse with clear water and allow the tile to dry for 24 hours.

Apply a layer of tile sealant with a paintbrush or sprayer. Wait 30 minutes and apply a second layer. Allow 72 hours for the sealant to dry. Reapply the sealant every three to five years.