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overflow plumbing help


something to reef on

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First time setting up a tank with an overflow. It's a 100 gal with two corner overflows, each has two holes drilled in bottom.

My thoughts are to put one durso type drain in each corner overflow, use one as a return, and setup one as an emergency drain. I am going to try to run about 800 gph through this. I beleive they are all 1 inch drains, I have not measured yet.

Is this an okay plan? I plan to plumb each drain independently to the sump, not tie them together.

Thanks

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It's most likely made for 1 drain and 1 return per overflow but you can configure however you want.

No problem running separate drain lines. This is preferable IMO. I would use a multi sock holder and run each of them into its own sock if you are planning on a berlin style sump. If one of the drains is just for emergency, don't worry about a sock holder for it.

As far as flow rate, I always find it easiest to get a reasonably sized pump and use a valve on the output to adjust the flow rate until you find an acceptable flow/noise. Hard to say whether 800 is too much for a quiet system, but I would imagine it should be fairly close to that. I think I am running about 350 through a single 1" durso on my 90.

If you're looking for a pump, the eheim compact and eheim hobby pumps are super reliable and about as quet as submersible pumps get IMO. I use a compact 3000 on mine, but it's mostly throttled down.

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Perhaps use the two drilled holes for the herbie and then just run the return flow behind the tank and over the back of the glass?

Yip that's what I did... I fought the idea of a return line over the back of the tank, but now that it's setup it's SO worth the one time trouble to get it done right.

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I have it dialed in now and rarely touch it. I'll peek at the emergency drain line to make sure it's trickling like I want, but I seldom adjust it.

I actually have dual overflows so I have two siphons and two emergency drains. It took a little tweaking to get them in sync, but now that they are its bulletproof.

I'm in Lakeway if you ever want to stop by to see.

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