3701-31-04(D)(6)(a)(4) / Spa free chlorine disinfectant residual shall be above 2 ppm.
Critical Repeat Spa free chlorine disinfectant residual was below 2 ppm. The free chlorine residual was 1.5 ppm.
Do not operate the spa until the chlorine disinfectant residual is at 2 ppm or above.