The microfiber spray mop for floors comes with 2 water tank for replace, you can add your favorite cleaning solution (Except boiling water) into the bottle of the hardwood floor mop, so that you don't need to carry with a heavy bucket anymore, just add water and the right amount of detergent in to the mop bottle, you will get your house floor thoroughly cleaned easily with this cleaning mop. It's so time-saving and labor-saving, even water-saving.