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Old 08-07-2009, 04:34 PM   #1
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This might be a dumb question but what is an overflow on an aquarium and what its purpose. Just curious.


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Old 08-07-2009, 04:54 PM   #2
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An overflow takes water from the display tank into the sump. The water is returned using a return pump. There's a good, basic picture on this link of how they work.

Melevsreef.com | Acrylic Sumps & Refugiums

The overflow is on the right.

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Old 08-07-2009, 05:48 PM   #3
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They can either be hang on back or internal, the internal ones have holes drilled through the glass (best). The hang on back overflows use a siphon tube (work good but you have to monitor them)
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Old 08-07-2009, 07:04 PM   #4
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Moved to General Hardware and equipment discussion.
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Old 08-14-2009, 04:19 PM   #5
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In short an overflow when done correctly will make sure all your tankwater wont end up on the floor in a power outage
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flow, overflow

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