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During the water filling process, the whirlpool spa hot tub must be closed, especially its water pump and nozzle system. It is strictly forbidden to operate the equipment when there is no water or the water level does not reach the safety line.

The water temperature of a whirlpool spa hot tub causes blood vessels to dilate, which leads to increased blood flow. If you stay in the tub for too long, abnormal blood circulation may cause low blood pressure, which manifests as dizziness, drowsiness, fatigue, and other symptoms.

Clean the inside of the jet with white vinegar or a special detergent. The acidic components in white vinegar can effectively dissolve scale and mineral deposits. Pour white vinegar into the inside of the jet and gently shake the jet to ensure that the vinegar can penetrate every corner of the jet. After soaking for 10 to 15 minutes, rinse it with clean water.

In 2007, UCSF conducted a study on 11 men with fertility problems and found that after using the hot tub for at least 30 minutes a week for three months, the number and activity of sperm decreased significantly. After stopping use, 45% of the participants increased their total sperm count by about 491% within 3-6 months.

The internationally recognized safe range of whirlpool spa hot tub water temperature is generally 36°C to 40°C, which is the temperature range that most adult users can comfortably and safely withstand: ·36°C: close to normal human body temperature, suitable for long-term soaking, especially for those who are sensitive to heat; ·37~38°C: ideal bathing temperature for most adults, with good relaxation effect; ·39°C~40°C: thermal therapy level temperature, suitable for short-term intensive hydrotherapy, used to relieve deep muscle tension.

-- Most insurance companies, based on standards such as the U.S. Medicare program, determine that only small hot water equipment designed specifically for medical purposes meets the DME standard. Common hot tubs are classified as personal care products, such as massage chairs, saunas, or swimming spas, and do not meet the definition of "medical devices."

Centers for Disease Control and Prevention (CDC) The CDC clearly states: Do not allow children under 5 to use whirlpool spa hot tubs because they cannot dissipate heat effectively and are more sensitive to hot water and chemical treatments.

Acrylic materials are not easily aged or brittle due to long-term contact with hot water or chemicals. During long-term use, whirlpool spa hot tubs are often exposed to hot water, detergents and chemicals. If the material is not resistant to aging, the surface will gradually wear out or become fragile and prone to cracking.

1. If the strict age, supervision, water temperature and strength control are not met, there is a significant risk for children to enter the whirlpool spa hot tub; 2. If they are over 9 years old, weigh close to adults, and are under professional adult supervision, they can use it.

The reasons for chlorine depletion in outdoor whirlpool spa tubs are: 1. Temperature 2. Frequent use of whirlpool spa tubs 3. Organic contamination 4. Number and weight of spa users 5. Environmental factors (pollutants, dust, pollen, insects) 6. Chemicals and detergents