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Old 04-28-2004, 09:55 PM   #1
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Siphon Break help!!!

I have 4 locline returns coming out of my overflow through the front and side of the overflow box. They are about 4-6 inches down form the top of the tank. I also have 2- durso drains in the same overflow. How do I do a siphon break on this setup? if the power fails will my tank drain untin it reaches 4-6" down where the 4 locline returns are???what do I do???
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Old 04-28-2004, 10:09 PM   #2
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You need to drill a hole in the 4 lines where you want the level of the water when the power goes out. I just had to do this on my system.
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Old 04-28-2004, 10:11 PM   #3
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so if the lines are 5" down...then the tank will drain to that level if the power goes out??

any way to prevent this?
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Old 04-28-2004, 10:15 PM   #4
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Yes. You need to drill 3/16" holes just below the water level in the return pipes from the pump. When the power goes out your tank will siphon down to the top of the skimmer on the overflows or to just below the 3/16" holes, whichever is lower.
If you don't have skimmer boxes and simply have the siphons 4-5" inside your tank than you have a poor design. Gonna flood.
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Old 04-28-2004, 10:21 PM   #5
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Drill a hole in the return line, inside the oveflow box, there will be a small stream going back into the overflow, but it's not a big deal and is how all the premanufactured overflow kits are designed, usually a 1/8 hole in the crook of the last elbow.
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Old 04-28-2004, 10:22 PM   #6
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ok, but wont it still drain as Anemoneman said until it reaches the 5" down to where the return lines are?
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Old 04-28-2004, 10:26 PM   #7
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No, if the hole is in the return line in the overflow and is above the waterlevel of the overflow, as soon as the pump stops, it will suck air and break the siphon. If you not convinced it will work, you could simply put a check valve on the return line
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Old 04-28-2004, 10:27 PM   #8
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but the return lines are 5" below the top of the overflow...so it would drain all that way no?

what check valves would be good to use?
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Old 04-28-2004, 10:37 PM   #9
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You'd have to research the check valves, I don't use them, I use siphon break holes drilled in the return line to suck are and break the siphon It works, once the hole starts sucking air in it, it breaks the siphon. If you want to test it, get a 3/4" ID nylon hose, about 4ft of it. Punch a hole in it about 6" from the end. Stick that end in your aquarium and the other in a bucket, start your siphon with the hole you punched in it (make sure the hole is open, if the nylon has sealed the hole it won't work) about 1/2 under water, let it drain and see what happens when the hole is exposed to the air....
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Old 04-28-2004, 10:38 PM   #10
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I'm a little confused. Do the return lines come up THRU the bottom of the tank (inside the overflow) and then exit thru the overflow wall 5" below the top of the overflow?
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