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When the pH level in a hot tub is too low, the water becomes acidic, which can have significant effects on the skin. Acidic water weakens the natural barrier on the surface of the skin, making the skin more vulnerable to chemicals and bacteria, which can cause problems such as rashes.

Hot tubs are typically set at a maximum temperature of 104 degrees Fahrenheit, which is the upper safety limit set by the U.S. Consumer Product Safety Commission (CPSC) and many hot tub manufacturers.

Generally speaking, the higher the horsepower, the greater the water flow and pressure, which can provide a stronger massage effect. In hot tubs, the horsepower of the water pump usually ranges from 1.5 HP to 3 HP, and can even reach 4 HP or more in some large hot tubs.

Although the massage function of a hydrotherapy massage bathtub can help relieve muscle fatigue and promote blood circulation, strong massage may not be suitable for patients with knee injuries. Especially when the soft tissues and ligaments around the knee are damaged, excessive massage may cause local mechanical pulling or pressure, further aggravating the injury.

After high-intensity exercise or long-term exercise, the muscles of the body will feel tight or painful. The warm water massage in the swimming spa can help relax muscles, promote blood circulation, and relieve muscle soreness.

Electric heater is the most common heating method, especially in outdoor spa massage bathtubs for home use. Electric heaters heat water by converting electrical energy into thermal energy. Its basic structure usually includes a heating element, a thermostat, a circulation pump and a safety device.

One of the biggest advantages of swim spas is that they can bring swimming and hydrotherapy into family life. Swim spas installed at home can be used at any time without going out or making an appointment. Users only need to enjoy high-quality water sports and relaxation experiences at home.

● Turn off the water supply to the bathtub and make sure the nozzles stop working. ● Drain the bathtub. ● Add about 2-3 cups of white vinegar to the bathtub, start the water pump, and let the vinegar water flow through the nozzle and pipes. ● Start the bathtub pump and let the vinegar water circulate for about 15-30 minutes to ensure that the vinegar water fully contacts the nozzle and the inside of the pipe.

Studies have shown that soaking in a hot tub for an hour may burn the same calories as taking a walk or doing a low-intensity exercise. This means that while hot tubs are not a replacement for exercise, they can certainly be used as an aid to weight loss, especially for those who are physically unable to engage in vigorous exercise, as hot tubs offer a low-impact, stress-free way to burn calories.

For example, an adult over 1.75 meters tall may need a soaking depth of 45 cm or more to ensure that the shoulders are covered by water. For people under 1.60 meters tall, a soaking depth of about 40 centimeters is comfortable enough.