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.
I think it is safe to expect that just about any car can idle for at least 1 day per tank of fuel. Keep in mind that if you are planning only on idling your car, you can cause damage due to buildups in the cylinders, fuel injectors, and exhaust systems if the engine isn't revved periodically.