Q. A tile merchant told me that you re-seal polished marble yearly and after 2 to 3 years you have to have it acid washed. Considering marble for bathtub surround walls and floor. Is travertine any less care? Live in hard water area.
A. The frequency of sealing your marble is going to depend on the use of the stone. It may need sealing once per year or even every two to five years. The best way to tell is to do a simple test by placing water on the stone. If the stone darkens then it is absorbing the water and it needs to be sealed.
As far as acid washing? Never use an acid on the stone! There is no need to acid wash the stone.
Travertine is a limestone and if it is not polished will require less care, but all stone is going to need regular maintenance.