Spa water foams excessively when jets are on.

Safety: No electrical hazard, but foam can indicate poor water quality.

• Test and balance water: Check calcium hardness and raise to manufacturer-recommended levels to reduce foaming.
• Use foam reducer sparingly: Add a spa-approved defoamer as a temporary fix.
• Rinse swimsuits: Rinse bathing suits thoroughly in clean water without detergent before use.
• Drain and refill: If water is old or heavily contaminated, drain the spa, clean the shell, and refill with fresh water. Replace or deep-clean filters.