When I moved to Austin in May 2014, the pool at my house needed a lot of repair and renovation. Watermark Pros were recommended for the tile and stone cleaning around the pool. They also "biocleaned" the coping stones we weren't replacing, and then sealed everything once the replaster and repairs were finished.
Chris and his team did a terrific job, making sure first that the bioclean would work, and then finishing the job as soon as the replaster was done so that the stone cleaning could be preserved.
Chris was quick to respond to my emails, answered all of my questions thoroughly and coordinated with the replaster and pool maintenance companies to ensure that everything was seamless. This went a long way toward reassuring me about the job.
I am happy to recommend them without reservation!