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Old 02-14-2005, 10:57 PM   #11
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your overflow box will never run dry. As the tank volume lowers it will stop adding to the overflow but it will retain water in both chambers and the U tube should hold its siphon. The only siphon that will break should be back siphoning in the return tube that goes from fuge to tank.
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Old 02-14-2005, 11:03 PM   #12
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Mine has never lost siphon, however it does collect air in the center so I have to siphon it out. If I had a pump to do this I could save me breath for more important things .
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Old 02-15-2005, 12:32 AM   #13
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If the siphon holds the water should push the air out when the pumps starts back up. Really if there is not air in it to start and the water level in the overflow is where it needs to be, air should not be introduced.

That being said, I did a DIY overflow box and always fought with it. I hate HOB overflows.
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Old 02-15-2005, 03:27 AM   #14
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Quote:
If the power is out for an extended amount of time, the main will drain into the sump until the siphon is broken because the water level is too low.
Not true with a well designed overflow, Trip. What you describe would happen if the overflow was just a simple "U" shaped siphon...but most are not.

A well designed overflow has 2 chambers, one on each side of the siphon tube. These chambers never empty, regardless of what happens to the tank level. As long as these chambers and the siphon remain full of water, the siphon will restart as soon as water starts to flow again.
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