SpaGuard is your best bet for your spa and hot tub chemical needs. Brominating sanitizer reduces odors and is also more effective in killing certain types of algae. If you have an uncovered outdoor spa, chlorine is the better method of sanitation. That is because the ultra-violet rays of the sun can destroy the sanitizer residual. Our chlorine system also oxidizes; meaning it eliminates undesirable compounds, such as oils, cosmetics and perspiration, from the water. Trust the brand that thousands of spa and hot tub owners use to maintain a healthy and relaxing spa and hot tub.