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Old 04-19-2005, 05:31 PM   #1
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pick out an overflow box for me.

Hello gang!

I need a very decent overflow box that pushes about 300 gph. pick one out for me!

thanks,
-Matt
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Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.

Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.

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Old 04-19-2005, 05:33 PM   #2
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www.aqauplumbers.com has a great one for the price. it will do upto 700gph

it all depends on the flow back to the tank.

good luck
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Old 04-19-2005, 05:43 PM   #3
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ahhhh....I see. So a 700 gph overflow wont nessicarily push 700 bph. it depends on whats dumping into the overflow box.

makes sense. would I be running the risk of breaking the syphon if I only push 300 gallons on an overflow rated for 700 gph?
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Hardware: 37 gallon SW tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.

Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.

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Old 04-20-2005, 12:05 AM   #4
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not on the ones from aqua plumbers. I can't speak for all of them. The ones on aqua plumbers once you make the syphon you will not have to worry about it again. won't break syphon for any reason except human intervention.
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Old 04-20-2005, 09:50 AM   #5
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For a low flow overflow I would have to suggest a CPR overflow as much as it pains me. I dont think much of them although many folks use them. I have heard to many horror stories about them losing syphon. Most of your "U" tube overflows will process between 600-700GPH with a single tube.
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Old 04-20-2005, 10:18 AM   #6
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so why, If you have heard so many horror stories, would you still recommend it?

I need something that will absolutely not loose syphon. I am an apartment dweller.
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Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.

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Old 04-20-2005, 10:39 AM   #7
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Because they are the only overflows that I know of that will do low flow like your needing. U tubes at that slow of flow rate could lose syphon simply due to slow water flowing thru the tube allowing air to collect causing a syphon break. boost the speed of your water flowing thru the overflow to 450gph - 600gph and you can go with a U tube and have nearly no problems.

CPR's with use of a good powerhead are suppsoed to not lose syphon.
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Old 04-20-2005, 10:44 AM   #8
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hmm... Perhaps if I boost my flowrate to 500 gph, I can then remove the extra maxijet and split the sump return in two to direct the water where I want?

I heard that the sump turnover rate should be no more than 10 times the total water volume otherwise there will be problems with micro bubbles. Is this true? Or only true on large systems? I do plan on building a baffle system into my sump to help reduce micro bubbles.
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Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.

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Old 04-20-2005, 10:26 PM   #9
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The ones that sell at www.aquaplumbers.com i have tested and tested and have had no problems using low flow high flow or just shutting off. Never lost its syphon! good product.

I have a couple people that run a rather low flow rate with these overflows and they seem to have to problems with bubbles. they do have some noise though. sounds like water runing.
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Old 04-20-2005, 10:54 PM   #10
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Quote:
Originally Posted by morphviper
they do have some noise though. sounds like water runing.
Kinda like the waterfall in my frog tank sitting riht nect to the SW tank...lol
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Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.

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