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Old 08-01-2003, 01:06 AM   #1
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DIY overflow any help?

here is my idea, sort of, any further ideas are greatly appreciated.
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Old 08-01-2003, 01:19 AM   #2
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you're on the right track!

you don't need the extra chamber on your inside "box"

and the chamber "baffle" or weir actually on the outside box needs to be "taller" - this is what sets your tank's water level.

it also prevents the siphon from breaking during water changes and the like

-

depending on how many GPH you want to flow, you may need 2 or 3 siphon tubes and drains ... I had a calculator for this at one time- i'll try to dig it up for you

going great - keep it up!
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Old 08-01-2003, 01:22 AM   #3
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here's the calc

http://reefcentral.com/calc/drain.php

I wish it was programmed to have a threshold to say you need 2 drains at 1.5 inches, rather than say you need a drain that is at least 1.92 inches

but it helps

just round up and divide, and then round up to the closest pipe size and you should be OK
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Old 08-01-2003, 01:29 AM   #4
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ok see if you like this
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Old 08-01-2003, 01:36 AM   #5
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ok, working idea any further suggestions? gonna use a "mushroom" drain
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Old 08-01-2003, 01:39 AM   #6
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almost there!

you have the drain and siphon sizes reverse, siphon should be bigger than the drain.

-----

I know you're planning teeth, but they're hard to draw!

about the teeth:

you will want to cut straining "teeth" into your internal box (1/4 inch is a popular size, spaced 1/4 inch apart), you want the bottom of the "teeth" to be at or below the same level as your outside weir ... this will ensure most efficient operation and minimize build up of debris inside the overflow

the tops of the teeth should come out of the water somewhat as well, to help prevent debris from "falling over" the edge and getting stuck in a siphon
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Old 08-01-2003, 01:48 AM   #7
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ok here it is updated
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Old 08-01-2003, 01:49 AM   #8
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oh, 1 more thing ... that 1" wide "space" between your inside and outside box is too much

measure the width of your tank wall, and then add like 1/8th" for fudge factor and use that as your spacing

safe bet would be at most 1/2" space
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Old 08-01-2003, 01:50 AM   #9
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yes 1/4 inch screens and 1/4 inch apart
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Old 08-01-2003, 01:53 AM   #10
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ok on the separation
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