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The water temperature of outdoor whirlpool bathtubs is usually maintained between 37 and 40 degrees Celsius, which is a suitable temperature for microbial growth. If the water quality is not well managed, the bacteria may multiply faster, increasing the risk of infection.

It is recommended to leave at least 2 to 3 feet (about 60 to 90 cm) of movement space around the hot tub so that users can comfortably enter and exit the tub. If the hot tub measures 7 feet x 7 feet, the area of ​​the terrace should be at least 9 feet x 9 feet (about 2.7 meters x 2.7 meters).

Ways to burn 1,000 calories in a swim spa: 1. High-intensity interval training (1 minute of high-intensity all-out swimming + low-intensity easy swimming, repeated 20 times), 2. Long-term aerobic exercise (1 hour of continuous swimming + water running + aerobics), 3. Combined with strength training.

Large hot tubs usually refer to those hot tubs that can accommodate multiple people at the same time, such as 6-person and 7-person hot tubs. This type of tub not only provides more space for use, but also has more functions.

Common home hot tubs are usually equipped with 3kW to 5kW heaters. For example, a 3kW heater can heat about 2°C to 3°C per hour. If you want to heat from 15°C to 40°C, it theoretically takes about 8 hours. In contrast, if it is a 5kW heater, the time required may be shortened to about 5 hours.

The relatively low power of the plug-and-play hot tub's heater means that the water will heat up more slowly in cold environments. Especially when the outdoor temperature is near or below freezing, the tub will take more time to heat the water to the ideal temperature.

Diseases that can be spread in hot tubs: 1. Legionnaires' disease (causing severe pneumonia), 2. Pseudomonas infection (ear, urinary tract infection), 3. Skin fungal infection (skin itching, erythema), 4. Norovirus infection (diarrhea, vomiting, fever), 5. Mold infection (cough, nasal congestion).

A hot environment causes the body to expend more energy to maintain internal temperature balance and stimulates the activity of the sympathetic nervous system. Increased activity of the sympathetic nervous system leads to increased adrenaline secretion, faster heartbeat, and possibly higher breathing rate.

Most free-standing hot tubs do not need to be fixed directly to the floor when installed. This is because the design and materials of free-standing tubs are usually stable enough, especially when filled with water, and the weight is greatly increased, so it is not easy to slide or tilt.

For most home outdoor whirlpool tubs, experts generally recommend draining and refilling every three months. This time frame is suitable for a bathtub with normal frequency of use, which can effectively maintain healthy water quality and prevent bacterial growth.

The Cleveland Clinic even reports on the benefits of water exercise for the heart. An article on the organization's website states that the cardiovascular benefits of swimming include improved cholesterol levels, lower blood pressure and a reduced risk of heart disease.

The use environment of a whirlpool hot tub is inherently very suitable for mold growth. Bathrooms are usually humid and poorly ventilated spaces. The humidity in the bathroom is further increased during bathing, and the water temperature is usually kept in a high range (30-40 degrees Celsius), providing ideal conditions for the growth of mold.