People who are not suitable for whirlpool spa hot tubs: 1. People with heart disease: The stress of whirlpool spa hot tubs on the cardiovascular system 2. People with high blood pressure: Hidden dangers caused by blood pressure fluctuations 3. Pregnant women: The effects of high temperature in whirlpool spa hot tubs on the fetus 4. People with diabetes: Temperature regulation and nerve damage problems 5. People with epilepsy: Risk of seizures and safety hazards 6. People with skin diseases: whirlpool spa hot tubs may aggravate skin problems

Shock treatment is very effective in removing green matter, especially algae, from whirlpool spa hot tubs. But this requires the correct dosage, appropriate treatment methods and continuous maintenance of the overall water quality of the tub.

If you want to maximize the space of a whirlpool spa hot tub in certain occasions, such as when hosting a party, a 7' x 7' tub can theoretically squeeze in up to 8 people. However, this experience may not be ideal.

Studies have shown that the amount of chlorine absorbed through the skin depends on the concentration of chlorine, the duration of immersion, and the individual's skin sensitivity. Although the amount of chlorine absorbed in a short period of time is small, prolonged exposure to chlorinated hot water may increase the total amount absorbed.

If the cyanuric acid content of the whirlpool spa tub is slightly higher than 50 mg/L, but not more than 80 mg/L, a gradual adjustment can be taken without immediately emptying the tub. The problem of excessive cyanuric acid content can be alleviated by the following methods: ● Partial water change ● Reducing chlorine content

The shell material of a whirlpool spa tub is one of the main factors that affect the price. Cheap whirlpool spa tubs are usually made of relatively low-cost materials, such as ABS plastic or other thinner synthetic materials. Expensive whirlpool spa tubs are usually made of higher-quality materials, such as acrylic.