Make sure your sanitizer, such as chlorine or bromine, is effectively killing bacteria. 2. Clean Your Filter Cartridge Every Two Weeks Your hot tub filter is the unsung hero of water cleanliness.

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.