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.
Four ways to be idle-free. 1  Turn off your ignition if youâre waiting more than 10 seconds. 2  Warm up your engine by driving it, not by idling. 3  Warm up the cabin interior by driving, not idling. 4  Protect your car engine by idling less.