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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.

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.

A user who uses the hot tub for a few hours a day may find that the heater fails after 4 to 5 years, while a user who uses it a few times a week may extend it to more than 7 years. Therefore, the frequency of use directly affects the life of the heater.

Steps to install a hot tub in the garden: 1. Preparation for installing a hot tub: ● Determine the installation location: ● Prepare infrastructure: ● Prepare electricity and water sources: 2. Steps for installing a hot tub ● Foundation preparation: ● Install electricity and water sources: ● Placement of the hot tub: ● Connect water and electricity equipment: ● Filling and debugging: 3. Precautions for installing a hot tub ● Safety considerations: ● Maintenance and care:

First, pour antifreeze into the nozzles and pipe system. These parts are most likely to freeze, so you need to ensure that the antifreeze can be fully covered. You can use a funnel to pour the antifreeze into the nozzle mouth and start the nozzle for a few seconds to ensure that the antifreeze enters the pipe.

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.

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.

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.