Ok, 
Not sure if this should really be EE or perhaps OT...
Now I saw small device set-up at a local retailer connected to a grinder.  The 
idea was that the device would save electricity, reduce noise and extend the 
life of the product.  (Sounds too good to be true.)
If I turned on the grinder about five seconds later it would quiet down and 
the meter they had their showed less power used.  How could/would this work?

And if this really could work by cleaning/manipulating the power on a single 
inductive load, how could this work on a whole house?
Here is a link to a whole home unit from the maker of the unit that I saw.
http://www.eslainc.com/pp2homeunit.htm

If these are for real, then:
- Why wouldn't all houses, etc. have units of some kind to perform this 
function?

- It sounds like something that would only work on inductive loads, like 
motors, fans, etc.  I would like to get one of these for a greenhouse (many 
motors and fans running 24/7) just would like to know some information about 
how this could work from somebody who is not attempting to make a sale.

- Would something like this cause me problems if main power failed an a backup 
generator kicked on?

- Any place I can read more information about this kind of thing?
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