Clorox Spa? Antifoam prevents and eliminates foam in spas and hot tubs. A foamy spa is one of the most common issues that spa owners experience. A little foam is okay but too much gets irritating and causes concern. Use the Clorox Spa? Test Strips to test your spa once or twice a week. Factors such as pH can change quickly so test regularly. Maintain a pH balance of 7.2-7.6 and 3-6 ppm of bromine. Drain clean and refill your spa every 90 days. Additional product benefits: Surface protection that prevents equipment corrosion surface stains and scale. Long lasting sunlight protection enriched with a chlorine stabilizer to extend the life of your clean. Stops Algae and prevents pool algae.