I know this should be a basic newbie question...but the more I read the more I learn. My dealer told me when I first got my tub to test the water before I circulate it because the bubbles will give a false reading. Yet I have read that people circulate the water before they test it...which is correct. Do open up the cover dunk in the test strips and go from there or do you run a pump or two without air and then take a reading? You'd think I would have asked this a little sooner :-/...but like I said my dealer is a weiner!