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					Originally Posted by apexifd  there are way less moving parts to fail.  only has 1 pump, and no electronic.
 so only one part will fail.  LOL
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 true . lol , how about parts that are not moving yet still fail ?? 
Think i have narrowed it down to either the GEO 612 , or GEO 618 . 
the 618 is just 6 inches taller and holds 4 more lbs of media . 
everything else is identical