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A cold plunge is really two purchases in one: the vessel you sit in, and the refrigeration and filtration system that keeps the water cold and clean. Most buyer regret in this category comes from underestimating the second half — chiller capacity, sanitation, drainage and ambient temperature all decide whether the unit is pleasant to live with.
Chiller capacity is quoted as a single number, but the temperature you get depends on water volume, insulation, ambient heat and how the rating was measured. Here is how the system really behaves.
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