eharri

Check PH. PH must be in the proper range, otherwise sanitizer will do wacky things. I was experiencing the same problem as you and tweaking the PH fixed it. Don't have to add sanitizer 2-3 times per week now. The test strips made it look like I was OK but depending on exactly where it's at those colors can blur together into a spectrum and get a bit iffy. IF the PH indicator looks borderline, check instructions for how much you have to add if it's at the very bottom of the recommended range. Adjust, run tub, test, sanitize, then see how the sanitizer level holds up over the next week.