Insinkerator not digesting its load

I have a Insinkerator, model Badger 5, 1/2 HP, that is not very consistent at grinding a load. The motor runs quietly and the blades on the on the rotating plate seem to swivel freely yet it doesn't complete the job. The unit is about 6 years old and the cutting surface on the outside perimeter does look a little worn and is rusty but I wouldn't expect that to affect the operation. I'm looking at this for an older couple so I have no day-to-day experience with the unit but i did not do much with a handful of carrots we tried to feed it. And the homemaker says it just doesn't work well.
Any advice? I hate to replace it for them without seeing something really out of whack with it.
John Keith snipped-for-privacy@juno.com
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Ask them what sorts of stuff they're trying to dispose of. Get a list of 5-10 things. There *are* foods that no disposal will deal with. Let us know what you find out.
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On Mon, 05 May 2008 00:21:15 GMT, "JoeSpareBedroom"

The list was typical table scraps and running water was always used (which was the only tip I got from Insinerators web page regarding possible problems.)
The home owners are willing to spring for a new unit so that's what we're going to do for them.
John Keith snipped-for-privacy@juno.com
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Wive's tale or not, the old adage is ice cubes, fruit pits, and steak bones will sharpen a disposer. It won't cost much to try, it won't harm anything, and worst case, will require replacement.
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I've used ice cubes for years in many disposers. I personally don't believe it sharpens. I just believe it clears the accumulated small bits and pieces that won't go down and are stuck in a place where the disposer grinding can't get at it.
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Thanks for the laugh.
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