Just found this site and I wanted to ask some advise. I just bought an 03 Sundance Altamar (no ozone), and set it up with the Baqua that came with it. My old D1 worked pretty well w/ dichlor & occasional MPS, but I have never really educated myself on the chemistry. Now I want to get it right. I am thinking that the BBB method might be the way for me. Can I make the switch w/o refilling the tub?