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If an outdoor spa hot tub is exposed to sunlight for extended periods, if disinfectant is insufficient, or if the filtration system is not functioning properly, algae will grow and multiply rapidly, causing the water to appear noticeably green or cloudy. This is one of the most common causes of "green water."

When the pH exceeds 8.0, carbonates precipitate under heating conditions, forming tiny suspended particles. These particles adhere to the foam interface, making the foam stronger and harder to dissipate. Therefore, high pH itself is not a "foam maker," but it is a "foam maintainer."

In fact, modern luxury swim spa tubs are equipped with advanced constant temperature systems and high-density insulation designs, so even when the outside temperature is close to zero degrees Celsius, the water temperature can still be stably maintained within a comfortable range.

When we soak in the hot water of a spa jacuzzi bathtub for an extended period, some of the skin's natural oils are removed, and moisture is lost from the stratum corneum, weakening the skin's protective barrier and causing keratinocytes to loosen and shed. This physiological reaction is more pronounced in winter or in people with sensitive skin.

When people bathe in whirlpool spa hot tubs, pores open and the skin barrier weakens, allowing microorganisms to easily enter the body through tiny openings. Potential health problems include: • Skin infections and folliculitis, • Respiratory irritation, • Eye and ear inflammation.

In a spa jacuzzi tub, the surrounding air humidity is high, making it difficult for the body to perceive moisture loss. Even if the body is "sweating," the warm, humid environment causes the sweat to quickly mix with water, so we don't feel it. However, the body's internal water is continuously decreasing through metabolism.

Not necessarily safe; it depends on the source of the foam and the water quality. If the foam is caused by residues of shampoo, conditioner, or detergents, it may contain fragrances, surfactants, etc., which can cause redness, itching, or contact dermatitis with prolonged contact or for those with sensitive skin.

If the pH is too low (below 7.0), it means the water is more acidic, leading to various problems. Many users have noticed that when the pH is consistently low, the water not only irritates the skin and eyes but may also become cloudy or whitish. This is not accidental but a result of chemical reactions.

The jet system requires sufficient air intake space to mix with the water flow and create a massaging effect. If the water level is too high, the air vents are submerged, preventing the system from drawing in enough air, resulting in weakened water flow and uneven jets.

Theoretically, showering in a whirlpool spa hot tub is physically feasible, especially in bathroom environments with installed shower heads or those combined with shower fixtures. However, feasibility does not equate to "recommendation."

Normal Range • A thin layer of foam is present on the surface of the whirlpool spa hot tub; • The foam dissipates automatically within 10–15 seconds after the bubbling stops; • The foam does not accumulate into a thick layer or stick to the walls. This type of foam is mostly caused by natural air agitation and will not affect the user experience.

In contrast, a swim spa hot tub uses a "reverse flow system" design. It creates controllable water resistance through a powerful water flow device, allowing users to "swim continuously" in place without actually propelling themselves forward.