HTH Spa Care Non-Chlorine Shock Oxidizer Clears Cloudy Water 2.2 lbs. Relax into fresh clean water with this easy-to-use non-chlorine shock oxidizer. HTH® Spa Non-chlorine Shock Oxidizer effectively reduces odor-causing ammonia and chloramines resulting in clear clean and healthy water. This product is great for bromine and chlorine systems. For best results use HTH® Spa Non-chlorine Shock Oxidizer as part of your regular HTH® Spa care routine. How To Use HTH® Spa Non-chlorine Shock Oxidizer With the filtration system on apply 2 ounces (4 tablespoons) of HTH® Spa Non-chlorine Shock Oxidizer for every 250 gallons of water. With the spa cover off circulate your spa water for 15 minutes.