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According to an article on the USA Today website, using a hot tub can help improve cardiovascular health. The article states that this is because "hot water can help blood circulation, lower blood pressure, and reduce arterial stiffness."

In the cold winter, ensuring that the water in the hot tub does not freeze is key to keeping it running. The main purpose of draining the water is to prevent water from freezing in extremely cold weather and prevent financial losses from burst pipes.

Long-term hot tub soaking may cause blood pressure fluctuations, especially in winter when the temperature difference is large. The warm water temperature causes blood vessels to dilate, and long-term soaking may cause a slight drop in blood pressure.

Baking soda is not the only substance that can increase the alkalinity of hot tub water. There are other chemicals on the market that are specifically designed for water quality maintenance, such as alkalinity increasers. These products usually contain sodium carbonate (Na₂CO₃), also known as soda ash.

If the hot tub is not shut down, the pump is still running, and the filter is in a working state driven by water pressure, and removing the filter rashly may cause the following problems: 1. Water gushing 2. Equipment damage 3. Safety risks

Calculate the amount of antifreeze required based on the capacity of the hot tub and the use ratio of antifreeze. For example, if the capacity of the hot tub is 300 gallons, and one quart of antifreeze is required for every gallon of water (a 1:4 ratio), then the total amount of antifreeze required is 300 quarts, or about 75 gallons.

If you have a small family or want to enjoy the fun of a hot tub with friends, a medium-sized hot tub is a good choice. This type of bathtub can accommodate 3 to 6 people at the same time, has stronger massage functions and a variety of nozzle layouts, suitable for deep relaxation and hydrotherapy.

If multiple people use a hot tub every day, contaminants such as body oils, sweat, and cosmetics will increase significantly in the water, which will accelerate the consumption of bromine. Frequent use means that bromine needs to be added more frequently to maintain its disinfecting effect.

People who are not suitable for outdoor hot tubs: 1. People with cardiovascular diseases 2. People with respiratory diseases 3. People with diabetes 4. Pregnant women 5. People with sensitive skin or skin diseases 6. People with poor body temperature regulation 7. Alcoholics and drug users 8. People with weak immune systems 9. People who are overly tired or dehydrated

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).

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.