Coolant filter

I'm looking for a way to filter the radiator coolant in a car, but can't find anyone around here who has ever tried. I found these online -- anyone ever tried an inline filter like these?

Tefba Inline Radiator Coolant Filter
http://www.tefba.com/
Unscrew the top and change the filter element without having to break the line.

http://www.ganofilters.com/
Clear plastic sounds like a good idea but I would probably go with the metal housing.

I don't know the filter rating for these, but this fellers says 200 micron is fine enough...

Repeat Component Failure Requires Heroic Efforts
By Kevin S. McCartney
https://secure.i-toolkit.com/www_cia...CONTA&k=1&pp=1
"It only needs to filter particles of about 200 microns (0.0078 inch) and larger in size. Filters that trap extremely small particles are not necessary and are more likely to restrict flow to the point of overheating."