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Old 06-21-2006, 03:39 PM   #11
src
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Quote:
Originally Posted by Alshain
gallons per hour is the amount of gallons it turns over per hour. I don't know how that could be measured any other way.

So in short... no, its exactly the same regardless of filter type.
I think the question had more to do with filter efficiency - i.e. if a cannister is a better (more efficient) filter than an HOB, how does that change the GPH you need to run through it.

Personally, I think that it's mostly irrelevant, but I believe that was the intent.
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Old 06-21-2006, 05:13 PM   #12
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Quote:
Originally Posted by src
I think the question had more to do with filter efficiency - i.e. if a cannister is a better (more efficient) filter than an HOB, how does that change the GPH you need to run through it.

Personally, I think that it's mostly irrelevant, but I believe that was the intent.
Its not about how much filtering it does as much as it is how much water it can filter in a specific amount of time. The amount of filtering it can do depends on the type of media you choose to use. As stated before, cannister filters have more filter media types to choose from. However, the difference between media is probably minimal. Media differences are mostly there for other reasons, such as AC or no AC, or how much surface are for bacteria.
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Old 06-21-2006, 08:14 PM   #13
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Okay, so for strictly mechanical filtration, HOB at 250 GPH and a canister at 250 GPH should be the same. I'm not sure I agree with that. Think about it.....you can can fit so much more filter media in a canister as opposed to a HOB....probably 4-5 times as much. That alone leads me to believe that all GPH is not equal. Especially when you consider the fact that a canister is putting that same 250GPH through 4-5 times as much media as a HOB would.
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Old 06-21-2006, 09:01 PM   #14
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For a hob filter I like to keep my tanks at a 10x turnover rate. For canisters I try to stay around 5 or so. They are much more efficient and you do not have to have the higher rates.
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Old 06-21-2006, 09:45 PM   #15
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Quote:
Originally Posted by Fishyfanatic
For a hob filter I like to keep my tanks at a 10x turnover rate. For canisters I try to stay around 5 or so. They are much more efficient and you do not have to have the higher rates.
I rememebr reading someting similar somewhere, I just can't remember where I saw it. That sounds about right though...
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Old 06-23-2006, 05:57 PM   #16
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for the money, Eheim is the best you can get IMO, you can get them with UV sterilzers and heaters in them and they have massive compartments for media, but if you want something cheaper, fluval's are nice
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