Our Sundance dealer was willing to upgrade to the Sundance warranty 10/7/5, if we bought a Sweetwater, which we considered. He was also willing to upgrade the SW to the micron filtration. I dont what the cost was for these separately, it was just all worked into the quote. Not sure if your deal is set in concrete, but maybe you can ask about doing this with your Sweetwater. Congrats btw, you will love your tub!