Strong chemical or musty odor from the spa water.

Safety first: Do not use the spa until water is properly sanitized.

• 1. Test sanitizer:
  • Check free chlorine or bromine levels and adjust to recommended range.
• 2. Shock treatment:
  • Perform a heavy shock to break down organics and combined chlorine.
• 3. Clean filters:
  • Remove and deep-clean filters with a filter cleaner solution.
• 4. Biofilm treatment (if recurring):
  • Use a spa plumbing cleaner to remove biofilm, then drain and refill.
• 5. Maintain routine:
  • Establish a regular schedule for testing, shocking, and filter cleaning.