Persistent foaming on water surface even after skimming; foam returns quickly.

Safety first: Handle all spa chemicals with gloves and eye protection. Never mix chemicals directly.

• Test water: Use a test strip or kit to check sanitizer, pH, alkalinity, and hardness.
• Shock spa: Add a non-chlorine or chlorine shock according to Coast Spas water care guidelines.
• Use foam reducer: Apply a spa-approved defoamer as a temporary measure.
• Drain and refill: If foaming persists and water is old, drain the spa, clean the shell and filter, and refill with fresh water.
• Rinse swimsuits: Rinse bathing suits in clean water only (no detergent) before use.