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Canister filter questions

This is a discussion on Canister filter questions within the Freshwater Aquarium Equipment forums, part of the Beginner Freshwater Aquarium category; --> So if you re-plumb the intake/output to a slightly bigger hose size, would that help in getting the maximum flow the motor is capable ...

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Canister filter questions
Old 03-23-2009, 11:17 PM   #21
 
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So if you re-plumb the intake/output to a slightly bigger hose size, would that help in getting the maximum flow the motor is capable of? Along with having the shortest possible output hose?
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Old 03-24-2009, 03:46 AM   #22
 
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I'm not sure that there would be a significant gain. It is the heighth and the distance that the water must travel from the canister up into the tank in my view,,along with the number of gallons to be moved that most of these motors or pumps are designed for. You would need some sort of reducing valve or fitting for where the hose meets the canister which I think would work against the increased flow that you want. Most folks place these canisters under the cabinet to hide them but if the canister was sitting higher ,say next to the tank or on a shelf or stand behind the tank ,then perhaps the pump would not have to work as hard to pump the volume of water for the height and distance would not be as far.
I do not know this to be so, It is a theory ,but perhaps,, someting to expieriment with?
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Old 03-30-2009, 08:16 AM   #23
 
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No, you're right on the money. Since you're going to have to neck the larger hose down to fit onto the canister's adapter you're not really going to see any appreciable gain from increasing the intake size. In fact since you're moving the same flow through a larger pipe you'll greatly reduce the flow velocity and make it harder for the intake to suck up solid particles like you want it to.

Since the plumbing on a canister makes it a closed loop system, or at least should, the canister isn't really having to pump the water up like you might think. It's more or less just working to keep the water moving. So the height isn't really as important as the length of hose. There's a drag associated with moving liquid through the hoses. The shorter the hoses, the less drag. Moving the canister as close to the intake and output as possible will shorten the hose and help it pump more efficiently.

You're not likely to see significant gains however. You'll get far more mileage out of minimizing the turns or at least their sharpness. A single 90 degree elbow can put more drag on the flow than feet of tubing.
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Old 04-01-2009, 04:15 AM   #24
 
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Since the plumbing on a canister makes it a closed loop system, or at least should, the canister isn't really having to pump the water up like you might think. It's more or less just working to keep the water moving. So the height isn't really as important as the length of hose. .

You're not likely to see significant gains however. You'll get far more mileage out of minimizing the turns or at least their sharpness. A single 90 degree elbow can put more drag on the flow than feet of tubing.[/quote


Interesting article in most recent issue of Aquarium Fish International on filtration. Head heighth .."many canister filters must pump water up to four feet vertically and back into the aquarium when placed under the aquarium in cabinet'' It seems we are both correct,Less hose or distance,the less work for filter to move the water.
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Old 04-01-2009, 06:47 AM   #25
 
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Yes, the water has to go up several feet, but it's also dropping several feet as well to get down to the canister. In a pumping system like that, and I've got several around my power plant, that dramatically reduces the amount of "lifting" the pump has to do. It has to make up for the pipe and filter media drag but very little real vertical head. The little pumps in most canisters just don't have the grunt to push water up four, five, or six feet back into the aquarium, not in the quantity you'd need for a filter at least. That's why its so important to get the air out of a canister set up.
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Old 04-01-2009, 06:59 AM   #26
 
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Agreed.Keeping filter media clean also helps to decrease the drag you speak of. Anything that works to slow down the efficency or capabilities of the filter has direct implications for fishes health.
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Old 06-05-2009, 12:05 PM   #27
 
I have a question. I just bought a used fish tank. The wife says that it is to loud, she can not sleep at night.

I have a 55 gal tank with a Whisper 30-60 running it. I have chichlids. Question is are canister filters quieter and more suitable for them? If so, witch one?

Thanks in advance.

Last edited by Loreley; 06-05-2009 at 12:24 PM..
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Old 06-05-2009, 03:19 PM   #28
 
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hello and welcome to you,
there are a few on the market from Eheim to fluval to rena.
i have a fluval canister external filter and it is very quiet.
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