Toedter says the ideal range for hot tub water pH and TA is 7.4 to 7.6 and 80 to 120 ppm, respectively, although this may vary slightly based on whether you use chlorine or bromine as a sanitizer.

Make sure your sanitizer, such as chlorine or bromine, is effectively killing ... Clean the shell, waterline, and jets with a dedicated hot tub cleaner. Use a vacuum to remove any lingering ...