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Old 05-21-2012, 11:34 AM   #31
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Why do the hang on back overflows have problem I've had mine on there for ten years never had a problem ????? What kind of problems do they have??? I've never heard of them ever haveing problems!
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Old 05-21-2012, 11:54 AM   #32
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They can loose siphon, leading to overflowing either the sump or DT. Thats why I use and recommend the CPR overflow with an aqualifter.
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Old 05-21-2012, 11:59 AM   #33
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I have never heard of that not saying your wrong i know a lot of people that have the same system and never had problem
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Old 05-21-2012, 12:00 PM   #34
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How do they lose siphon inless u some how lose In coming water
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Old 05-21-2012, 12:02 PM   #35
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Comes from sucking to much air. It ended up happening to me when my aqualifter burnt out.
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Old 05-21-2012, 12:03 PM   #36
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I have heard those CPR overflows are bad because u can't clean them
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Old 05-21-2012, 12:08 PM   #37
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I'm confused not that that is hard lol if it goes throw the first tube to the over flow the only place I'm getting air ever once and I while is right there where it goes to down to the sump and there's no wait for that to stop it because it going down so the water has to go down I am a stupid brick layer!!
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Old 05-21-2012, 12:16 PM   #38
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I clean mine just fine with a toothbrush and pipe cleaner.
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Old 05-21-2012, 01:31 PM   #39
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Couldn't I put shut off vaulves on either end of all the piping and just remove it to clean when I do water changes?
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Old 05-21-2012, 07:23 PM   #40
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Quote:
Originally Posted by J33ps
How do they lose siphon inless u some how lose In coming water
They can suck in air and overtime it can build up in the top of the U breaking the siphon. Also in event of power outage siphon can break and when the power kicks back in your return will start and flood the display. Its a fairly common problem with hang on overflows. They do work and siphon loss can be reduced and prevented for the most part however the risk is there and i know if i had tens of gallons water on my floor the wife would kill me and the damages would be high.

Usually the only reason or instance a hang on overflow is recommend is when the tank is already setup and established and cannot be drilled.

Also before drilling make sure the glass you are drilling is not tempered. If it Is it will shatter. On most tanks only the bottom glass is tempered however this is not always the case. Best to call the manufacturer to make sure.
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