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.
Engine misfiring, in which the engine halts for a moment and then continues on as if nothing happened, is one sign of trouble. Engine surging is a signal that this heart of the automobile is having combustion problems, and spark plugs are part of that difficulty. A lack of acceleration is also a danger signal.