Eheim Classic 250

A series of external filters Eheim Classic is virtually unchanged for several decades. New series of filters, with additional features, is very user friendly, some of them can even connect to the computer, but the Classic series are still in service.<br />
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And there are serious reasons. <br />
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1. The input and output of the filter is located in different places - the entrance from the bottom, output on top, which guarantees the passage of water through all filter media.