9/12mm line on an Eheim 2227 canister filter
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9/12mm line on an Eheim 2227 canister filter

This is a discussion on 9/12mm line on an Eheim 2227 canister filter within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> What is the 3rd, small, 9/12mm, line used for on an Eheim 2227 Professional canister filter? If you remove it from the water it ...

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9/12mm line on an Eheim 2227 canister filter
Old 04-09-2011, 02:38 PM   #1
 
9/12mm line on an Eheim 2227 canister filter

What is the 3rd, small, 9/12mm, line used for on an Eheim 2227 Professional canister filter? If you remove it from the water it sucks in air, and will not filter correctly. I have no idea what it is used for. Anyone out there have any idea it's purpose?
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Old 04-19-2011, 07:17 PM   #2
 
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Ok, I finally figured out the answer. Took me a while to find the Eheim manual on-line. The third line is a "breather" line that should not be inserted under the water (see your instruction manual!). Apparently this particular model pump works like a wet/dry filter and "pulses" the water through the pump. It alternately submerges the media and then uncovers it again to increase oxygenation. You can make the pump behave like a typical canister if you plug that smaller tube. I suppose the advantage of the pulsing behavior is to suck air in the breather tube and increase oxygenation of the media, just like a traditional wet/dry filter.

The intake of air through this line is normal.

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Last edited by DKRST; 04-19-2011 at 07:19 PM..
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