Clean Air and Water - Are Filtration / Purification Devices Helpful? Which Ones have you used or Researched or would Like to use, or know somebody who Has in use and You Want One Like It, etc. Which ones are quick and easy and while nowhere near the be all end all device, if used correctly can help more than harm on a cost benefit basis? What is the maintenance schedule for the proper use of these devices? For example, if the filter in fridge is not rotated out on an effective basis, Lead and other debris can collect to the point that the filter will slough off what they call 'Slugs' of this crap as the filter element becomes overloaded, somewhere back there in the bowels of the fridge. These 'Slugs' as one could imagine are wayyyyyy more concentrated with the very collected crap that the filter's in there to help you, mr and mrs homeowner, to prevent from entering your and your family member's digestive systems. Do you have a filter in your fridge? What is the recommended rotation schedule? Lead is shown to decrease IQ especially in youngsters, but it ain't no bonus treatment for Anybody. Have You Seen Junior's Grades? His folks are overjoyed...