Spa water has a persistent musty or moldy odor despite chemical treatment.

Safety: Handle spa chemicals with gloves and eye protection. Follow label directions.

• Shock the spa: Add a non‑chlorine or chlorine shock treatment at the recommended dose to oxidize organics.
• Clean or replace filter: Remove the filter and clean thoroughly or replace if over 1 year old.
• Use a plumbing line cleaner: Add a spa system flush product and run all pumps and jets per product instructions to remove biofilm from LA Spas plumbing.
• Drain and refill: After flushing, drain the spa completely, wipe the shell, refill with fresh water, and balance chemicals.