(1) Spas must comply with all other applicable provisions of these rules.

(2) Spas that are not flow-through hot springs spas must be operated at a water temperature not exceeding 104°F as determined by the use of an inline thermometer. A spa that is a flow-through hot springs may not operate at a temperature above 106°F.

(a) An inline thermometer is required for all spas and the spa operator shall also have an accurate portable thermometer and shall manually check the water temperature as required by these rules to help ensure that the temperature does not exceed the maximum allowable temperature.

(b) The operators shall verify the accuracy of their manual thermometers periodically in an ice bath. The temperature of an ice bath should read 32°F.