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Cloudy water is one of the most common and obvious warning signs. Healthy spa hot tub water should generally be clear and transparent, allowing you to easily see the structure of the bottom and the outlines of the jets. If you notice the water turning slightly milky, hazy, or losing clarity—even without a noticeable odor—you should be alert.

Many nozzles contain rotating internal components. To achieve effects such as pulsating massage, rotating massage, or multi-angle spraying, some whirlpool hot tubs employ rotating nozzle cores. These components undergo continuous, slight rotation or vibration during operation.

If you have not had hot water for a long time or repeatedly encounter problems with the cooling of the bathtub water, it may be due to a malfunction in the hot water supply system. In this case, it is best to contact a professional plumber or maintenance personnel to inspect and repair the problem to ensure your safety and comfort.