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Old 06-15-2005, 02:12 PM   #11
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http://www.csd.net/~cgadd/aqua/overflow.htm

okay theres the site, go down to the faq. you need an overflow that can siphon water faster than your pump. then it should regulate itself from what ive read
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Old 06-15-2005, 02:16 PM   #12
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generally on the feed and return lines to the sump, you add ball valves or something similar. This way you can regulate flow in both directions. But even with that, the basic concept is the water is always pumped from the sump to the tank. And periodically, the waterlevel in the tank will rise above a certain threshold and the overflow will kick in - refilling the sump.

Since this process is periodic and dynamic, it will eventually reach an equilibrium state where the water level in the tank stays pretty constant.
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Old 06-15-2005, 04:39 PM   #13
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Originally Posted by krap101
ive heard you dont need to match the pump at all you just need an overflow box and when the water level goes under a certain point it stops siphoning until the water is pumped back into the tank. ill try and find the site
With too much pump, the sump empties too fast (faster than the overflow can fill it) and either the tank floods or the pump runs dry. (this is assuming no fancy cut off switches). Both are bad.

With too little pump the sump level will rise and the tank level will drop up to the level that the overflow box is set. Then the sipon/overflow decreases so that the sump stops filling. So it is best to use a smaller pump than your overflow, you can regulate tank volume and sump volume by the overflow hieght. An overflow that can flow faster than your pump is best for safety and convenience. So decide how much pump flow you want, then build or buy an overflow that is greater than that. How much greater? Don't know. I never measured the ones I had, bought them complete.

But it would be trouble to have a pumnp that is faster than your overflow.
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Old 06-15-2005, 04:46 PM   #14
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your overflow box needs to be able to handle more flow than your pump.. its not really a matching thing.. its more of making sure the water can get out of the tank as its being put in..
Ive seen homemade syphon overflows that are made of PVC and a pieces of flexible hose.. they dont skim the surface of the water though.
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Old 06-15-2005, 04:52 PM   #15
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yeah i couldnt really explain it
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Old 06-15-2005, 07:29 PM   #16
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This is becoming an interesting thread....I have a few more questions about this.....what would be the minimum sump size for a 50 gal? Do you have to have an overflow box to have a sump? Are there any basic setups that aren't so complicated?
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Old 06-15-2005, 07:34 PM   #17
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This is becoming an interesting thread....I have a few more questions about this.....what would be the minimum sump size for a 50 gal? Do you have to have an overflow box to have a sump? Are there any basic setups that aren't so complicated?
pump size is the same as the cycles per hour of your filter..
overflow box.. its not the only option.. alot of people drill there tanks and put in bulkheads.. there is another option Ive ran across as well..
http://www.angelfish.net/yabbse/inde...;threadid=7024
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Old 06-15-2005, 07:42 PM   #18
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so... its just tubing put into a loop with a hole?
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Old 06-15-2005, 07:51 PM   #19
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so... its just tubing put into a loop with a hole?
the hole is at the top of the water level of the tank.. but yes its just a hose in a loop.. there is a version made of pvc.. if you keep reading.. more links as well..
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Old 06-15-2005, 07:58 PM   #20
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okay. i think i might use this. this will make my life alot easier than making the over flow and crap. ill probally use a suction cup to keep it in the tank.

and is there a specific shape that it has to be? like circle oval etc?
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