Spa water has a strong musty or moldy odor even after adding sanitizer

Safety: Wear gloves and eye protection when handling spa chemicals. Ensure good ventilation.

• Shock the spa: Add a high dose of chlorine or non-chlorine shock according to Bullfrog's water care guidelines. Run all pumps and open all JetPaks to circulate.
• Use a plumbing cleaner: Add a spa system flush product designed to remove biofilm. Run pumps and let it circulate per product instructions.
• Clean or replace filters: Remove filters and soak them in a filter cleaner solution, then rinse thoroughly. Replace if they are more than 1–2 years old.
• Drain and refill: After circulating the cleaner, drain the spa completely, wipe down the shell and JetPaks, then refill with fresh water.
• Balance and sanitize: Adjust pH and alkalinity, then bring sanitizer to the recommended level and maintain it consistently.