(1) A pool, spa, or other water feature shall be closed immediately whenever a reading falls into one or more of the following categories:

(a) the chlorine or bromine reading is outside the minimum and maximum allowed parameters set in ARM 37.115.1308, Table 6;

(b) water temperature exceeds the maximum set in ARM 37.115.1308, Table 6;

(c) pool clarity fails to meet the parameters set in ARM 37.115.1308, Table 6; or

(d) pH of the water is less than 7.0 or higher than 7.8 except flow through hot springs which can have a pH up to 9.4.

(2) When a pool, spa, or other water feature is closed based on water chemistry readings, the operator shall document the closure and the reason for the closure and shall maintain the documentation in its files with other required records.

(3) When the critical water quality parameters are brought within the acceptable range set out in ARM 37.115.1308, Table 6, the pool may be reopened with the approval of the department.