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#3
09-13-2011, 11:56 PM
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They do work but take some "tweaking" to get balanced, and once you get that "sweet-spot" you have to keep it...an ATO is a must in my opinion.
I could be wrong but it looks like you might have one of the elbows upside down, not sure, kind of hard to tell from the pics. Main and secondary siphon _ elbows point down Emergency overflow - elbow points up Length below water in sump is also a factor, play around with some sleeves before you glue anything and see if that is the issue. You also need an air tube from secondary to overflow box to start secondary as full siphon to prevent an overflow in case an air bubble is temporarily trapped in main siphon and needs to be pushed out.....I don't see one?? 
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