Vitrified Paving. Dreadful experience. Despite all marketing literature and YouTube posts for simple brush in grout for the beautiful vitrified paving i purchased, Marshall’s sent their ‘new’ wet mix paving grout. What a mess. Concrete staining to the paving and eroded grout lines. When I asked Marshall’s technical/customer care dept for help, they couldn’t get rid of me quick enough...’not their fault...a installation error’. Decent paving, dreadful attention to detail and dreadful service. The measure if any company is when you do have a problem, what their response is. I just needed practical advice. They saw a problem they would rather not assist with and ran a mile.