From a chemical perspective, bromine is very suitable for high-temperature, low-volume systems like spa hot tubs. Reasons include: • Less prone to rapid degradation at high temperatures • Longer-lasting disinfection effect • Higher tolerance for water quality fluctuations

The main function of chlorine is disinfection, not "cleaning" or "clarifying" the water. It's important to emphasize that chlorine does not have a physical filtration function. It cannot directly remove suspended particulate matter, nor can it "disappear" solid impurities already present in the water.

From a professional standpoint, reducing the chlorine odor in a spa hot tub requires a systemic approach: • Stabilize water chemical parameters. • Ensure efficient operation of the filtration system. • Ensure adequate water circulation. • Control the accumulation of pollutants in the water.

Considering industry standards, design structure, ergonomics, and water capacity, we can arrive at a clear answer: a standard 4-person hot tub is generally suitable with a capacity between 700 and 900 liters, and internal dimensions of 180–200 cm in diameter or length and width.

Frequency of Use The more frequently a spa hot tub is used: • Increased organic matter input • Faster disinfectant consumption • Earlier onset of cumulative problems A frequently used spa hot tub naturally requires more shock disinfection.

From a physiological perspective: • The warm environment helps muscles relax • Vasodilation may improve local blood flow • The buoyancy of water can reduce the load on joints and muscles Therefore, using a spa hot tub appropriately after exercise can indeed help relieve tension and stiffness.