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Old 04-04-2008, 02:30 PM   #1
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Sump return question.

I am in the process of setting up my sump. I have been reading alot and have viewed Melevsreef.com - Welcome! . That is a great site and extremely helpful. My only question involves the return line. He says to avoid overflow he drills 2 small hole in the return line about 1/2 in down from the water line to use as a siphon break. I have also been reading about others who have added Check Valves in the return line to also solve this issue. Any advice between the 2 methods? What do most people do? Drilling 2 holes is easier and less expensive than buying check valves and actually having to do the plumbing. Is it as effective though? Thanks!
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Old 04-04-2008, 02:41 PM   #2
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My returns are between 1" and 2: below the water level of the tank. No need to drill any holes in the retrun lines as the siphon breaks naturally as the water level falls.
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Old 04-04-2008, 03:14 PM   #3
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I drilled my returns as you described. Works perfect. Just need to determine how much flow back your sump can handle and drill appropriately.

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Old 04-04-2008, 03:42 PM   #4
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If you have a small sump that can't handle that much water flowing back from the return pump then I suggest drilling the holes. A check valve can fail and you will end up with a flood. Make sure to check those holes every once in a while they can get clogged. When I do a water change on my tank I take a tooth pick and clean them out. I have mine above the water level so I have an instant siphon break.
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Old 04-04-2008, 03:49 PM   #5
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Ziggy, If you have yours above the water line, isn't water pushed through the holes back into the overflow instead of the tank? I am just wondering about the efficiency and gph circulating.
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Old 04-04-2008, 03:58 PM   #6
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It's a 1/8 hole...there is only a tiny amount of water coming out of that hole...I have 2 return pumps on my system total of about 1100gph so I'm not worried about that tiny bit of water. I am much more concerned with a power outage and flooding my basement.

Oh and the water coming from those holes goes into my tank not the overflow. I don't have an internal overflow.
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Old 04-04-2008, 04:19 PM   #7
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I don't have holes drilled and get floods ALL THE TIME!!! It's a pain, lol. I know how to prevent it, I just need to lift my spray bar up out of the water to break the siphone but sometimes I try to cut corners and just "be fast!" It's never much water and only ever happens when my sump is particularly full, so I just deal.
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Old 04-07-2008, 09:54 AM   #8
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I began setting things up this weekend to do a test on the system. I was just going to go with the drilled hole, but as I set up the return piping, I didn't like the way the plumbing was in the sump, so I decided to try my luck at PVC pipes and fittings. It was surprisingly easy. With that, I added a checkvalve and I am happy to report that all it works fine. Thanks for all the advice!
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