I checked it this evening and the FC was close to 2 ppm. I put in 1 cup of clorox bleach, ran the tub for 10 minutes. Checked it and the FC 7 or 8 ppm. It was in between the 5 and 10 ppm color on the strip. No one is using the tub tonight, so we'll see what it is tomorrow. Thanks for helping me out.