Technically speaking, most spa jacuzzi hot tubs do use ordinary tap water for filling. However, this does not mean that tap water can always be used directly without any treatment.

In fact, baking soda (sodium bicarbonate) is a common, fundamental regulating agent in water treatment. When used in appropriate amounts, it can influence the water's pH level and alkalinity balance. Consequently, people sometimes use baking soda when maintaining the water quality of their spa hot tubs.

From a water quality management perspective, most professional recommendations favor shocking the swim spa hot tub at night. This is because the nighttime environment allows the sanitizer to work more stably without being compromised by intense sunlight.

Intense rainfall can cause a large volume of water to enter the swim spa hot tub. This not only dilutes the chemicals but also introduces a higher level of contaminants. In such cases, the water may require additional treatment.

Theoretically speaking, excessive chlorine levels can indeed be linked to water turbidity in a spa hot tub; however, this relationship is not a simple, direct cause-and-effect scenario. Chlorine itself is a transparent chemical substance; it does not directly cause water to become cloudy.

Under normal conditions, the chlorine odor in a spa jacuzzi hot tub should be relatively mild. If the water surface emits a very distinct, pungent odor, it typically indicates that the chlorine concentration in the water is likely elevated.