Do you need a filter plugged in when the power is off?

No, the filter will not be doing anything at all when it is plugged-into an outlet that has no power. So if you have shut a room off, or a circuit off at the breaker panel, you do not need to have Stetzerizer Filters plugged into any of those "dead" outlets. Some people shut the power off to their bedroom at night. You could use the filters elsewhere at this time, or leave them plugged-in so that they will be in place when you turn the power back on.

Always have filters on circuits that ARE powered - check every outlet. Even if you don't use a room, unless you keep the power off all the time you should have 1 or more filters installed in the room.

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