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#1
11-06-2011, 04:05 AM
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I am no expert, but if the stockman pipe (backup or failsafe) can handle the return flow of your return pump on its own, then I wouldn't think there is an issue, unless both plug. Now if either one plumbing, CAN'T handle the return flow on its own, then yes you would potentially have a problem.
But again, as I stated, I am no expert here.
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 Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite) Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO) Type of Aquarium: mixed reef (SPS & LPS) with fish Dosing: Mg, Ca, Alk 
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#2
11-06-2011, 08:47 AM
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If I completely turn the ball valve in the closed position imitating a clog the stockman can't handle the flow and will over flow.
As for the drawing. The red thing is the ball valve and the circle going into the sump is a bulkhead. The over flow is an external overflow. I ideally would want to use the Herbie method, but with the 2 lines joining into one this doesn't work. Not sure what I can do from here.
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