The concentration is calculated on the volume of water that is in the well. The concentration must be at least 200 milligrams of chlorine per litre of water present in the well and must be left in the well for at least 12 hours to ensure any bacteria present are.
idles; idled; idling. Learner's definition of IDLE. 1. of an engine or vehicle: to run without being connected for doing useful work. [no object]. She left the engine idling for a few seconds before she turned it off. The cars idled in traffic.
idle verb [I]. âº If an âengine idles, it is âoperating but not doing any âwork: Let the âengine idle for a âminute before you put the âcar in âgear. (Definition of idle from the Cambridge Academic Content Dictionary Â© Cambridge University Press).