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Old 12-29-2008, 12:15 AM   #1
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new refeug.

hey guys sorry to starte a new thread but i built my first 20gal refug. for my 72 gal SW tank i didnt document the build (it was very clumsy) keystone cops like lol. Heres my problem when i do a powerfailure test it will flood what am i doing wrong here i would app. any tips or advice of things yall see i did wrong or missed
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Old 12-29-2008, 12:39 AM   #2
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You will need a small hole in the output hose just below the running water level. This will break the back siphon into the sump. Try about 1/32 size hole half way between power off and running. Please tell me you have a overflow box or a drilled tank! If not you will need to start there.
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Old 12-29-2008, 09:35 AM   #3
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Yep. yep. Siphon break needed. Small hole as described.
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Old 12-29-2008, 09:09 PM   #4
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ok so put a hole on the u-tube that goes from the tank to the overflow box on the overflow side just below the desired water line .....do i have that correct????
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Old 12-29-2008, 09:24 PM   #5
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DIY Overflow Box

The overflow system should have 2 boxes. The one with fingers goes inside the tank with the fingers at water level. the overflow box goes outside and should have two compartments one side is the output to sump the other is for the siphon tube. when the power goes off the siphon tube ends stay under water. If the siphon breaks I use some airline pushed up into the top of the tube's bend to suck out all of the air. The small hole is in the tank on the output about half way between pump off and pump on water level.

I hope this helps
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Old 12-29-2008, 09:27 PM   #6
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no

not a hole in the overflow box siphon

a hole in the return line.

when your power goes out, the water that the return pump is trying to pump up to the tank drains back down into the sump. Since the return line from the pump into the tank is under the water level line in the display tank, when this happens it creates a siphon, so that the return line then starts drawing water out of the display tank back down into the sump.

To alleviate this, in your return line, just under the water level, drill a hole in the return line so that when the water level gets below the hole, it will suck air instead of water.
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Old 12-30-2008, 12:13 AM   #7
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does the hole affect the flow while power is on ??? or since its below water line it keeps solid flow (did i just get it ) new pics above
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Old 12-30-2008, 12:15 AM   #8
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no real affect

Get a pic if your return line, I'll mark it where to drill
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Old 12-30-2008, 12:39 AM   #9
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ok its the bottom right pic not the best if you need better let me know ill try to get one
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Old 12-30-2008, 01:24 AM   #10
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Photo MIA.
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