1. Children: Children 2 years and older can use the hot tub for a short period of time, but must be accompanied by an adult. 2. Teenagers: Moderate relaxation and exercise recovery, 10-20 minutes per session. 3. Adults: Relieves muscle fatigue, promotes blood circulation, and promotes psychological relaxation, 20-30 minutes per session.

Common whirlpool spa hot tub malfunctions include: 1. Water temperature fails to rise 2. The pump makes unusual noises or does not produce water 3. Uneven water flow from the showerhead or weak spray 4. The control panel malfunctions or displays an abnormal display 5. Cloudy water or an odor 6. The power supply trips or fails to start

• Regularly test the pH, hardness, and residual chlorine content of the hot tub water. • Adjust the dosage of disinfectant and water conditioner based on the test results to maintain stable water quality. • Use a water quality testing kit to ensure that water quality meets safety standards.

• Hot water temperatures are generally between 37 and 40°C (111-124°F), and some bathtubs can be even higher. • High temperatures may affect the balance between the sympathetic and parasympathetic nervous systems, leading to vasodilation and changes in heart rate.

Water temperature is a core indicator of the whirlpool spa hot tub user experience and is directly related to user safety: • Temperature Range The recommended water temperature for a whirlpool spa hot tub is generally between 37°C and 40°C. Temperatures below 37°C may reduce comfort, while prolonged soaking above 40°C may cause low blood pressure, increased heart rate, and even dizziness.

The bathtub area may become slippery due to ice or splashing water in winter, increasing the risk of slips. Recommendations: • Install non-slip mats or rubber mats. • Keep the surrounding floor dry. • Use a ladder or handrail to assist in entering and exiting the bathtub.