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Old 01/15/2007, 04:35 PM   #1
Teknagen
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help too much water noise

Ok I have my tank setup and filled with water.

The water draining out of tank isn't a constant stream of solid water as I suspected. Is this normal?

..And every couple of minutes the water draining out of tank into sump, makes a loud "flushing" sound. Is there a way to prevent this flushing effect?

No camera available but I've attached an drawing of my water drain.




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Old 01/15/2007, 05:10 PM   #2
EdKruzel
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You can add a baffle to the sump to help deaden the noise.


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Old 01/15/2007, 05:35 PM   #3
artman18944
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in the top of the "T", on the outside of the tank, is there a hole?


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Old 01/15/2007, 06:21 PM   #4
pcurry18
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if there is a hole, you need an aqualifter. They suction all the air out and maintain the siphon.


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Old 01/15/2007, 06:38 PM   #5
danch
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Actually, the drawing shows a pure gravity overflow, no syphon is needed.

In fact, if it doesn't have a hole, a syphon will be forming and breaking, with the sucking noise coming when the syphon is broken. This is like the surgin phenomenon in a Durso standpipe: if the pipe can't keep up with the return pump, the water level will rise. When the water level gets over the pipe, no more air will be let in, forming a syphon. A syphon will move more water in the same pipe (because there's no longer any air), so the water level drops below the top of the pipe, braking the syphon. Air is then sucked in, causing the flushing noise.

You really want a weir box on the inside there, so that you do more surface skimming, but to kill the noise, you could try putting an elbow on the inside of the bulkhead, pointed down. Then a small airhole in the top of that T will allow the water level to remain even and above (by an inch or so) the opening of the elbow. That would be a variant of the Durso (go to http://www.dursostandpipes.com/ and look at "External Overflow" under "Popular Modifications" for something similar. The bottom of the "Build your own Standpipes" page has a faq explaining the flushing effect I tried to describe above)


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