I purchased a home that had an extensive amount of limestone tile.  It looked like it may not have been sealed for a while so I contacted a couple companies to get quotes/options on what I could do. Bio Tile seemed to be the most knowledgeable/professional and the price (while not the lowest) was quite fair in my mind. The crew that came out to do the work was punctual, polite, and clearly knew what they were doing.  Once complete they told me how to clean the tiles going forward, what to expect, etc… Will definitely use Bio Tile to reseal in the future.