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Old 09-11-2012, 09:57 PM   #11
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If your return is only pumping up 1000 gph, then that's the most that will overflow into the box. So your 1200 gph will be able to drain it back down as fast as the pump is returning it.

The critical thing is to make sure your overflow can handle the flow the return is pumping out. Otherwise your return section of the sump will allow air into the pump. Not good.
Of course, a restrictor valve in the return will help prevent that.
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Old 09-11-2012, 10:18 PM   #12
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the overflows are rated at a certain gph as well as the return pump is rated at a certain gph as long as the return pump doesn't pump the water back up faster than the overflow boxes can draw the water back down you shouldn't have any issues, example the overflows in the 150 I have have a combined flow rate of @1400 gph the return pump is rated at a flow rate of @1350 gph but factoring in the head height of 4 1/2feet the effect of gravity on the water in the return lines reduces the pumps flow to @ 1200 gph which the overflows are more than capable of handling, if my overflows were rated at 1000 gph and I still ran the pump at 1200 the tank would quickly flood, but on the other hand if I had overflows rated at 2000gph and ran the same pump at 1200gph the overflows would only draw the 1200gph provided by the pump as the overflow can only take the water down to a set level, I hope this better explains what I meant in my first post, just getting up for work and haven't had my coffee yet so the brains processing a little slowly, my apologies
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Old 09-11-2012, 10:26 PM   #13
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Okay so if I got the 1200 over flow box and a 1200 pump it wouldn't work?
(I'm running slow today too, thank you guys for being patient.)
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Old 09-11-2012, 11:19 PM   #14
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Quote:
Originally Posted by Zactheninja
Okay so if I got the 1200 over flow box and a 1200 pump it wouldn't work?
(I'm running slow today too, thank you guys for being patient.)
Just my opinion you dont need 1200gph goin thru your sump 600-1000 gph is what i reccommend that is if your skimmer is insump and fugi because they will work more efficiently if water is not flying past if no skimmer or fugi in sump then go big to increase flow
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Old 09-11-2012, 11:52 PM   #15
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I was actually considering a hob skimmer, but I'm not sure about it.
So you think I need to do the two over flows? That would hit about 600gph. And if I got a 600 gph that would work right?
I'm just going off of what it says for gph on the over flow,
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Old 09-11-2012, 11:54 PM   #16
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Quote:
Originally Posted by Zactheninja
I was actually considering a hob skimmer, but I'm not sure about it.
So you think I need to do the two over flows? That would hit about 600gph. And if I got a 600 gph that would work right?
I'm just going off of what it says for gph on the over flow,
Yes return pump should be equal or less than overflow rating is it hob overflow?
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Old 09-11-2012, 11:56 PM   #17
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Yeah, tank isn't drilled.
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Old 09-12-2012, 12:11 AM   #18
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Quote:
Originally Posted by Zactheninja
Yeah, tank isn't drilled.
My hob overfow came with i think it was 1" u-tube i ended up buying 2- 1.1/4" u-tubes to handle a 800gph return pump i believe each u-tube rates at 500gph each so just make sure overflow is rated higher than whichever pump you use but try and make it close or your u-tubes will get airpockets in them resulting in flood
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Old 09-12-2012, 12:13 AM   #19
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Quote:
Originally Posted by Zactheninja
I was actually considering a hob skimmer, but I'm not sure about it.
So you think I need to do the two over flows? That would hit about 600gph. And if I got a 600 gph that would work right?
I'm just going off of what it says for gph on the over flow,
Back ti this ? Yes if overflow is rated at 600 you got pump at 600 youd be fine remember to calculate the gph loss for however far the pump has to push the water
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Old 09-12-2012, 12:17 AM   #20
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Quote:
Originally Posted by danbstrong

My hob overfow came with i think it was 1" u-tube i ended up buying 2- 1.1/4" u-tubes to handle a 800gph return pump i believe each u-tube rates at 500gph each so just make sure overflow is rated higher than whichever pump you use but try and make it close or your u-tubes will get airpockets in them resulting in flood
Okay. I think I got this now, thank you!
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