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Dispenser freezes the water in the reservoir. The cold water slows and then stops as a block of ice forms in the inside of the dispenser. In removing a panel on the rear that has 4 screws, I see on either side of the unit there are rheostats with an adjusting screw.
The freezing point of water becomes lower as more particles are added until the point where the salt stops dissolving. For a solution of table salt (sodium chloride, NaCl) in water, this temperature is -21 C (-6 F) under controlled lab conditions. In the real world, on a real sidewalk, sodium chloride can melt ice only down to about -9 C (15 F).