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The freezing point of water is 32°F (0°C). When the outside temperature is lower than this point, the water will gradually freeze. In the use of an outdoor spa hot tub, if the water stays in the pipe without sufficient flow or heating, the water in the spa hot tub pipe will begin to freeze when the temperature drops below 32°F.

Hot tub disease (Hot Tub Lung), also known as "hot tub lung disease", refers to a lung disease caused by specific microbial infection or allergic reaction of the human respiratory system after inhaling water vapor or aerosol in a hot bathtub. It is a rare but real respiratory disease that is mainly related to a bacterial infection called "nontuberculous mycobacteria" (NTM).

If an outdoor spa hot tub is used frequently, especially when used by multiple people, the pollutants in the water will increase rapidly and the rate of ozone consumption will also increase. In this case, it is recommended to refill the spa hot tub with ozone every day.

On December 31, 1979, the U.S. Consumer Product Safety Commission (CPSC) issued Notice No. 79-071. The notice clearly warned that hot tub water temperatures reaching or exceeding 106°F (about 41°C) could cause serious health problems, especially heat stroke.

If the air in the pump and pipes is difficult to exhaust, you can try to tilt the outdoor hot bathtub appropriately to allow the air to concentrate at one end of the pipe before exhausting.

Most outdoor spa bathtubs have an exhaust valve on the water pump. After turning off the power, gently loosen the exhaust valve of the pump to let the air in the pipe naturally discharge until you can no longer hear the sound of gas flowing out. Note that the water pump should not be running at this time to prevent the water pump from sucking in more air.

The main component of vinegar is acetic acid (acetic acid), which is usually a 5% concentration in water. Acetic acid is somewhat acidic, which means that it can effectively clean the surface of outdoor spa hot tubs by neutralizing alkaline substances or dissolving mineral accumulation.

This means that when all devices are running at the same time, the maximum power of the bathtub is 4840 watts. If used for 2 hours per day, the daily power consumption is: Daily power consumption = 4840 watts × 2 hours = 9680 watt-hours = 9.68 kWh If used for 30 days per month, the monthly power consumption is: Monthly power consumption = 9.68 kWh × 30 = 290.4 kWh

Drowning risk This is one of the most obvious risks. Sleeping in an outdoor spa bathtub may cause people to slip or sink their heads into the water. No matter how high the water level in the spa bathtub is, it is difficult to maintain balance when a person loses consciousness while sleeping, especially under the buoyancy of the water, the body may slide deeper into the water.

If the whirlpool spa bathtub is a frequently used device, it is recommended to clean the jets once a month. If the frequency of use is low, the cleaning interval can be extended, but deep cleaning should be performed at least once every three months.

In general, it is necessary to test the outdoor whirlpool hot tub water quality at least once a week. This applies to most whirlpool hot tubs for home and private use. Testing once a week can help detect water quality problems such as high or low pH, insufficient chlorine content, etc. in time.

Most outdoor hot tub covers have a very limited weight capacity, usually between 50 and 100 pounds (about 23 to 45 kilograms). This means that they can withstand some minor pressure, such as the weight of leaves, snow or rain, but are not suitable for adults or heavy objects to sit directly on them.