(1) The pool water purification system must be run sufficiently to maintain the conductivity of the pool water below twenty microsiemens per centimeter under normal circumstances. If pool water conductivity rises above twenty microsiemens per centimeter, the licensee shall take prompt actions to lower the pool water conductivity and shall take corrective actions to prevent future recurrences.

(2) The licensee shall measure the pool water conductivity frequently enough, but no less than weekly, to assure that the conductivity remains below twenty microsiemens per centimeter. Conductivity meters must be calibrated at least annually.