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Old 10-22-2009, 10:57 PM   #31
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I was testing out several pvc overflow configurations and found the flow to be horrible, went to a straight siphon and it works great with plenty of flow into my test setup in the yard. Is there anything wrong with using a straight siphon? To me it's very simple and works.
Just from reading: Straight siphon you have a full siphon effect and I think that they are louder. HOB overflows use these but they are slowed down by U tube or passage.

Please if someone has used this method I would like to hear about it too.
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Old 10-23-2009, 07:02 AM   #32
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It didn't make any noise. I think I'm going to go that rout.
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Old 10-23-2009, 01:15 PM   #33
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"It seems to me that if you set the sump in place with the DT level at the bottom of the overflow, so no water is running through it, then fill up the sump all the way and fire it up, you will never have a problem with the sump overflowing if the power goes out. Is there something I'm missing in that logic? Newbie to SW for please forgive my ignorance."
To answer that question, it would depend on the flow rate of your return pump. If it pushed to much water into the DT it would overflow from the DT. If it's the other way around then the sump might overflow.I may be wrong in this logic,but that's why I call it a hobby...it's a learning thing.......
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Old 10-23-2009, 02:35 PM   #34
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as long as you do an overflow and dont have a line coming off the bottom of the tank in to the sump, there is no logical way for it to overflow... im in the "planning" stage of building my wet/dry from a 55g tank, i plan on using 2" pvc... the only way water is going to come from the tank to the sump is by water being pushed from the sump to the tank... the overflow will be set just right so that only water pumped up from the sump to the tank will come back down the overflow... so unless the overflow clogs up, there is no way anything will overflow...
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Old 10-23-2009, 10:18 PM   #35
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Update on plumbing

I started the plumbing today and chose to go with a straight siphon. I got about 90% done today, the only thing left to do is drill holes in the main and fuge intake pipes and set the return and intake to the correct depth.. Here are some pics of my progress. Also had to relocate my eheim outside the tank otherwise I wouldn't be able to get it out if something were to happen with it.

The Eheims new home, Poor guy

The other pics
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Old 10-23-2009, 11:57 PM   #36
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OK, got to ask what is the blue line and valve for?

With your drains like that wouldn't it cause alot of back pressure?
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Old 10-24-2009, 03:58 AM   #37
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please post pics of your "straight siphon".
if its what i think youre talking about, it is a VERY bad idea.
hopefully i am wrong.
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Old 10-24-2009, 06:29 AM   #38
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OK, got to ask what is the blue line and valve for?

With your drains like that wouldn't it cause alot of back pressure?
The blue valve is to start the siphon. Not sure exactly what you mean by back pressure?
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Old 10-24-2009, 08:53 AM   #39
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please post pics of your "straight siphon".
if its what i think youre talking about, it is a VERY bad idea.
hopefully i am wrong.
I haven't completed the pickup in the DT yet, but is going to operate as a direct U tube from tank to sump via the manifold so i can independently control the flow into each compartment. Here is a pic of the DT intake which may change to a straight down tube with a siphon break.


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Old 10-24-2009, 12:16 PM   #40
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To answer that question, it would depend on the flow rate of your return pump. If it pushed to much water into the DT it would overflow from the DT. If it's the other way around then the sump might overflow.I may be wrong in this logic,but that's why I call it a hobby...it's a learning thing.......
Hmmm...I would think that if you were using a DT with w built-in overflow, whatever levels your DT and sump were at would eventually reach a natural equilibrium if there was only enough water to keep the sump full w/no power and not enough in the sump to overflow the DT if the overflow got clogged and the sump drained to it's minimal level for any reason. Of course, you could never have your DT completely full, and that's the problem. But it would only be a problem if your overflow line got clogged - snail example is a good one, I talked to someone who had that exact problem and took apart the whole tank before figuring it out.
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