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Old 07-19-2015, 04:52 PM   #11
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Quote:
Originally Posted by Reefing Madness View Post
No logic would not dictate that, check valves are not recommended to be used in overflow for sumps nor returns, period, not for back up or primary. More than one anti siphon holes is recommended.
Where and what size would these be? Would they be right next to each other, or one higher than the other?

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Old 07-19-2015, 05:06 PM   #12
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Just drill an 1/8" hole straight through the pipe, 1/2" below the water line when the tank is running normally.
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Old 07-19-2015, 05:25 PM   #13
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Straight through top to bottom? Wouldn't the hole facing up potentially spray water when the return pump is on?

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Old 07-19-2015, 05:47 PM   #14
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my returns all are drilled above the water level(all 14 of my locklines).
Never noticed water shooting out or bubbles being drawn in(like venture).
Just know my tank could syphon back if they weren't their!
many use check valves but I do not.
I would wonder if the pressure of the water/valve may effect the pump on "re start?"as one of my sumps is located in basement below my 180g a good 8-10 feet of head pressure?
I also have at least one of my two returns after the split at or within 3/4 " of surface.
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Old 07-19-2015, 07:25 PM   #15
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[ATTACH]Click image for larger version

Name:	Siphon hole pic.jpg
Views:	41
Size:	13.7 KB
ID:	275381[/ATTACH]

Like these, except drill straight through pvc
Attached Thumbnails
Click image for larger version

Name:	AntiSiphonHole2.jpg
Views:	34
Size:	13.1 KB
ID:	275380  
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Old 07-19-2015, 07:35 PM   #16
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Got it thanks.

So back to my other questions re: the sump design. I'm thinking just an intake and return chamber. Or will I need 3 since I'm running a carbon reactor in it as well?

If 3 chambers, I'm thinking 8" baffles on the intake chamber and 4" between the center and return chamber. Thoughts?

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Old 07-19-2015, 09:08 PM   #17
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You'd only need 2 chambers, the intake, which would have your bubble trap, then the other chamber for all your goodies.
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Old 07-20-2015, 10:26 AM   #18
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Awesome. Thank you. WRT the number of baffles, should I use 2 or 3 to separate the chambers? Is my 8 inch height still accurate?
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Old 07-20-2015, 11:31 AM   #19
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Only need 2 baffles in the front, thats going to be your bubble trap.
8" baffle sounds ok, how tall is the sump itself?
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Old 07-20-2015, 11:42 AM   #20
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sump is a standard 15 gallon tank, 12" tall.

I'm thinking of a 1" gap between the baffles, with the intake chamber being about 2/3 of the tank, and the return section the remainder. I'd have the skimmer and heater in the intake portion, with the carbon reactor/MJ1200 in with the return pump.
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