Foam builds up on the water surface when jets or bubbles are on

Safety first: Foam itself is usually not dangerous but indicates contamination that should be addressed.

• Skim foam: Use a skimmer net or cloth to remove foam from the surface.
• Use defoamer (optional): Add a spa-safe defoaming agent according to instructions for temporary relief.
• Improve hygiene: Ask users to shower before entering and avoid using regular soaps or oils in the spa.
• Water change: If foaming is persistent, partially or fully drain and refill the spa, and clean the shell and filter housing.