I had a marble specialist come seal all my natural surfaces yesterday. He did my marble countertops, floors, shower floors and sealed all the grout. He told me this was the absolute best to neutralize the ph and prevent stains and etching on your natural surfaces. This gallon will last you years! He said dilute it in a spray bottle for counters and mop with it! He also suggested having designated mop heads for your natural surfaces, especially if you use other cleaners in the house. LTKHome LTKdayinmylife LTKSaleAlert