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Most outdoor massage bathtubs have a heating function, and the water temperature can be adjusted to a suitable temperature as needed. Warm water helps dilate blood vessels, promote blood flow, and speed up metabolism.

Jack Wilson, a spa equipment expert, said: "When choosing a hot tub shape, the most important thing is to consider practical needs and space conditions. Square hot tubs offer more functions and capacity, while round hot tubs have advantages in aesthetics and comfort. Consumers should make choices based on their usage scenarios and preferences."

Reasons why massage bathtubs need dedicated circuits: safety considerations (avoid circuit overload and reduce the possibility of electrical failure), avoid insufficient power supply, and comply with the National Electrical Code (NEC).

The basic function of an ozone generator is to provide purification for outdoor hot tubs by converting oxygen (O₂) into ozone (O₃). Ozone generators generally use two methods to produce ozone: corona discharge and ultraviolet light irradiation.

A whirlpool bathtub is a bathtub that produces a whirlpool effect by jetting water. It circulates the water in the bathtub to multiple nozzles through a built-in water pump system, and then sprays it out at high pressure to produce a powerful water flow.

The jets of a whirlpool bathtub are usually located in different parts of the bathtub, covering the main parts of the body, such as the back, waist and legs. The jet function is driven by a water pump, and the water flows out of the jets at high speed, forming a water flow impact similar to massage.

Acrylic is a plastic with high transparency, good gloss and strong toughness, which is widely used in the manufacture of hot tub shells and bottoms. Its surface is smooth and easy to clean and maintain.

The high temperature environment of a hot tub can dilate blood vessels and increase blood flow. Good blood circulation helps to transport oxygen and nutrients to cells throughout the body, promote metabolism and cell repair. This is helpful for delaying aging.

In a hot tub without a filter, the water quality will deteriorate rapidly. Impurities and dirt cannot be effectively removed, and suspended particles, bacteria, and algae in the water will increase rapidly.

Whirlpool tubs typically hold 50 to 150 gallons (about 190 to 570 liters) of water, depending on size. Small whirlpool tubs are more suitable for family bathrooms and are usually about 60 inches long, 30 inches wide, and 18 inches deep, with a capacity of between 50 and 70 gallons.

Chemicals needed for swimming spas: 1. Chlorine disinfectant 2. Bromine disinfectant 3. pH adjuster 4. Alkalinity adjuster 5. Hardness adjuster 6. Metal chelator 7. Oxidant

For people who are in good health and have no obvious health problems, it is recommended to soak in a 104°F (40°C) hot tub for 10 to 15 minutes. This time is enough to enjoy the relaxing and soothing effects of a hot tub while avoiding the adverse effects of soaking for a long time.