Persistent foaming on the water surface even after rinsing filters.

Safety first: Avoid using the spa until foam and water balance are corrected.

• Test and balance water: Adjust pH, alkalinity, and calcium hardness to Master Spas recommended ranges.
• Use foam reducer: Add a spa-approved defoamer as a temporary measure.
• Shock the spa: Perform a strong shock treatment to oxidize organic contaminants.
• Drain and refill: If foaming persists, drain the spa, clean the shell, replace or deep-clean filters, and refill with fresh water.