If you experience this, be sure to use a small amount of Leisure Time Foam Down for a temporary solution. Foam is caused by many things that are introduced into the water itself, and turning on the jets will agitate whatever that may be, in turn causing more foam. A few tips to eliminate foam, would be to shower before entering your spa. If you or any of your guests have lotion, make up, hair products, etc. on while using the spa, this will cause foaming. Also, be sure to always rinse out your bathing suits before using your spa. The detergents in common laundry soap will also cause foaming.