Thirty day water change:
At the end of the first thirty days of spa ownership, you should do a water change. Foam is a pretty good sign that you are ready. I have recommended this to my customers for years, and it really helps a lot. A lot!
Turn off the power, drain the tub, a lite rinse, and fill 'er up. Once full, do any air bleeding or other special steps your spa needs, run the jets for a few moment, and then balance the water chem.
Heat, and add people.