<prompt> What is the recommended level of chlorine in Swimming pool?0.5 mgL0.8 mgL1 mgL5 mgL  <response>: Residual chloride levels in: i.e. after the contact period of one hour Drinking water- 0.5 mgL or ppm Swimming pools- 1.0 mgL To kill Cyclops in Drinking water - 2.0 mgL Residual chlorine level can be measured using chloroscope Ohotoluidine test. 