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 adjective (NOT WORKING). C1 not âworking or being used: Half these âfactories now âstand idle. It's âcrazy to have Â£7,000 âsitting idle in the âbank. âº An idle âmoment or âperiod of âtime is one in which there is no âwork or âactivity: If you have an idle âmoment, âcall me. âº without âwork: Almost âhalf of the âworkforce are now idle.