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Old 07-07-2004, 10:26 PM   #1
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404 as Sump Pump

Well, looks like the sump thing is something im going to have figure on my own. But, has anybody thought of using a Fluval 404 to pump water out of the tank and in to the sump......it flows at 340 gph out? Or am i crazy!
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Old 07-07-2004, 10:55 PM   #2
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Wouldn't recommend it unless it's used to return the water to the tank. Even then there wouldn't really be enough flow through an overflow (if used) to maintain the syphon. If the water was gravity fed to the sump and then the 404 was used to return the water, that might work. Just be sure nothing is used in the canister to restrict flow.

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Old 07-07-2004, 11:13 PM   #3
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I just said overflow as an example. Im talking leave the intake in the main tank, then put the return line into the sump. I just don't like the whole gravity feed-poweroutage-water everywhere thing. If the canister is pumping into the sump, i wouldn't have to worry about that. What do you think.
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Old 07-07-2004, 11:28 PM   #4
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If you could match the flow rate it would work, but if you left enough room in the sump it would drain until hte overflow slots then stop.Assuming your sump has the room it would be fine
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Old 07-07-2004, 11:49 PM   #5
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Well, it puts out 340 gph, if i put a Mag 5 in the sump, it would pump 380 because of the height, then i could turn it down a little to match the 404. My sump is going to be 29X12X13, thats as big its gonna be, i figure about 15 gal.
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Old 07-08-2004, 08:29 AM   #6
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Odds that you will get them to match exactly: 1:10000
Odds that it will be a major headache: 2:1
Water all over your floor or a dry sump: Priceless
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Old 07-08-2004, 08:54 AM   #7
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Quote:
Odds that you will get them to match exactly: 1:10000
Odds that it will be a major headache: 2:1
Water all over your floor or a dry sump: Priceless


You never run out, do you?

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Old 07-08-2004, 09:37 AM   #8
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How do you get an overflow box to match the return, water all over the floor is my major concern.
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Old 07-08-2004, 11:46 AM   #9
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Quote:
Originally Posted by Crawling68
How do you get an overflow box to match the return, water all over the floor is my major concern.
The overflow will only empty into the sump the amount of water that is pumped into the main tank by the return pump from the sump. Basically if the pump quits, the water from the main tank will only drain until it it gets below the top level of the overflow and then the syphon should break or simpley stop depending on type. If the sump is only operating at ¬Ĺ full volume, it should be able to hold the extra water without any spills. You would need to do a few tests to determine the best fill line for the sump though.

Having a pump to the sump and a return pump from it would be disasterous as Bearfan pointed out. If there was a problem with one and the other continued, you would definately have a large mess.

Gravity feeds (drilled tanks) to the sump will not cause a mess in the event of a power failure. If the return pump (404) quits, no more water will empty into the sump. The biggest concern with an overflow is that it may lose it's syphon during the outage and once power is regained the return pump will empty the sump into the main. That is why many of us do not recommend "C" type overflows. The Best are "U" type overflows for preventing this kind of issue. You can also drill a hole in the top of the return line just below the water line as a syphon break for the 404 to prevent back syphoning.

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Old 07-08-2004, 03:18 PM   #10
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Ok, im understanding more now. That is why i join forums before i do things, to prevent disasters. Now, i want the return to power a SCWD instead of the powerheads, would a mag 9 be too much. What i mean is, having that much flow out of the tank and back in. Should i build a separate, closed-loop sysem for that.
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