3701-31-04(D)(6)(a)(2) / Pool free chlorine disinfectant residual shall be above 1 ppm.
Critical Observed no free chlorine.
In order to reduce the risk of contamination, ensure that the pool free chlorine disinfectant residual is above 1 ppm. Do not operate the pool until the chlorine disinfectant residual is at 1 ppm or above. Treat the pool.