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Most common wooden or composite decks are designed to withstand a load of about 40 to 60 pounds per square foot (about 200 to 300 kilograms per square meter). However, 4-person hot tubs often weigh much more than this.

Open the drain of the hot water tub and let the water flow out naturally. If the tub does not have a built-in drain, a submersible pump can be used to speed up the drainage process. Use an air compressor or a wet-dry vacuum cleaner to make sure that any residual water in the pipes is completely dried to prevent antifreeze residue.

Muscle and Joint Pain: For athletes or people with chronic pain, hot tubs can provide effective relief. For those with arthritis or other joint problems, saunas can provide comprehensive pain relief.

In a hot bathtub, heat stimulation will accelerate the heart rate and increase the heart load. For the elderly, the heart health is not as strong as that of young people, and the rapidly accelerated heart rate may cause the heart to be unable to bear it.

The height of a hot tub also affects water consumption and energy consumption. Deeper bathtubs require more water and energy to heat, increasing the cost of use and the environmental burden.

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.