Possible Cause: High concentration of chemicals, body oils, cosmetics and other contaminants due to heavy bather load
Solution: Use Spa Selections® Foam-Out. Shock oxidize with Spa Selections® Non-Chlorine Shock Oxidizer. Treat with Spa Selections® Non-Chlorine Shock Oxidizer weekly to prevent organic contaminants. Drain and refill spa at least every three months.
Possible Cause: Calcium hardness too low
Solution: Adjust calcium hardness above 200 ppm. Test and adjust as necessary to maintain total alkalinity level of 80 - 120 ppm and pH level of 7.2 - 7.8.