i’m going to tile my countertop with travertine tiles. I know they utilize a thinner grout when using granite. What print of grout is this, how weak can I do it, and where do I take it?? Travertine Countertop more

i’ve travertine countertops in my kitchen that have become stained and have water marks and another marks on it. I tried a few chemicals to attempt to take the stains off, however was unsuccessful. Can any shed light on what I need to do to take my countertops looked good for second time? I actually appreciate some more