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37.115.1307    DISINFECTANT USE

(1) The physical and chemical conditions in the water of the pool, spa, or other water feature shall be maintained within the ranges specified in these rules. Chemicals added to the water shall not cause irritation to the eyes, skin, or mucous membranes of the bathers.

(2) All pools, spas, and other water features when open or in use must be continuously disinfected by a chemical that imparts a residual effect and must maintain an alkaline pH. Dispersal of the disinfectant agent must occur by mechanical means.

(3) In pools, spas, and other water features using chlorine as a disinfectant, breakpoint chlorination ("super chlorination" or "shocking") is required when the combined chlorine reading reaches 0.5 ppm or greater.

(4) To super chlorinate or shock a pool, spa, or other water feature that has a combined chlorine reading of 0.5 ppm or higher, the operator must, at one time, add free chlorine equivalent in an amount that will bring the free chlorine reading to a level at least ten times greater than the combined chlorine reading.

(5) Super chlorination or shocking cannot be undertaken while any bather is in the pool, spa, or other water feature. The pool, spa, or other water feature may not be reopened for any user until the level of chlorination falls within the parameters set in ARM 37.115.1017.

History: 50-53-103, MCA; IMP, 50-53-101, 50-53-102, 50-53-103, 50-53-104, 50-53-106, 50-53-107, MCA; NEW, 2010 MAR p. 80, Eff. 1/15/10.

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