3701-31-04(D)(6)(a)(2) / Pool free chlorine disinfectant residual shall be above 1 ppm.
Critical Repeat Pool free chlorine disinfectant residual was below 1 ppm. Observed free chlorine disinfectant residual to be ~ 0.25 ppm.
Do not operate the pool until the chlorine disinfectant residual is at 1 ppm or above. Raise disinfectant residual to acceptable levels.