Water has a strong chemical or musty odor despite normal sanitizer levels.

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

• Shock the spa: Add a non-chlorine shock or chlorine shock per QCA Spas water care guidelines to oxidize contaminants.
• Clean or replace filter: Remove the filter cartridge, deep clean with filter cleaner, or replace if more than 1–2 years old.
• Use a plumbing cleaner: Before the next drain, add a spa plumbing purge product to remove biofilm from QCA Spas plumbing lines, then drain and refill.
• Maintain regular water changes: Drain and refill the spa every 3–4 months under normal use.