overflow questions
Printed From: Utah Reefs
Category: Specialized Discussion
Forum Name: DIY
Forum Description: Do it Yourself
URL: http://www.utahreefs.com/forum/forum_posts.asp?TID=1394
Printed Date: July 21 2026 at 2:59pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: overflow questions
Posted By: Crazy Tarzan
Subject: overflow questions
Date Posted: December 03 2003 at 12:27pm
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I have figured out how I want the rear system of my overflow box to work, however I am still having problems determining some things. One, how do I determine the level of the water in the fish tank? Two, how do I make sure that I don't break the vacuum by pulling too much water out (vs the return flow) into the back overflow box? What size siphon pipe should I use to achieve about 200, or a little more, gph? Are there any formulas I should use? Thanks, Nate |
Replies:
Posted By: jfinch
Date Posted: December 03 2003 at 12:46pm
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The level of water in the fish tank will be at whatever elevation the inlet weir (overflow) on the internal box. The secondary weir in the external box needs to be an inch or so lower then the inlet weir. Both ends of the syphon need to be lower then the secondary weir. For 200 gph, (total guess on my part) I'd try a 3/4 inch tube. If it can't keep up move to a bigger tube, if air bubbles get trapped in the top of the syphon tube then move to a smaller tube. If you have both problems then lower the secondary weir. A picture is worth a thousand words, but I can't draw here. ------------- Jon https://www.youtube.com/channel/UC6y_EzjI_ljbIwf2n5uNzTw" rel="nofollow - What I've been doing... |
Posted By: Mark Peterson
Date Posted: December 06 2003 at 10:11am
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Have you read my article on the Simple Overflow? You need to email me and ask for it. It answers these questions.
Nothing less than one inch pipe/tubing should be used because it needs to flow as freely as possible. Air bubbles are not that hard to deal with when you know how. ------------- Reefkeeping Tips, & quick, easy setup tricks: www.utahreefs.com/forum/forum_posts.asp?TID=9244 Pay it forward - become a paid WMAS member 
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