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Old 11-16-2011, 11:35 AM   #1
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Why I distrust the commercial aquarium industry claims

I know there are plenty of examples around. But I was reading a thread on filters and started looking at canisters this morning, when I read this;

"The Fluval 405 Aquarium Canister filter provides 35-55% more volume than would be possible with round canisters of the same outer dimensions. Increased volume means a greater mass of filter material and a larger filtration area"

Most all of us have had junior high geometry and can calculate the area of circles and rectangles. Only the in the mind of some marketing tool could you reach this idea about 'outside dimensions'. Has this filter so little to offer that this is the best they can do? I'll leave you all to consider the math for yourselves.
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Old 11-16-2011, 12:41 PM   #2
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Not sure I follow. Are you saying that a 4" circle has the same area as a 4" square?
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Old 11-16-2011, 12:47 PM   #3
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I think BillD nailed it. They are saying the Fluval 405 (square) that is, let's just say, 6"x6" would have more volume than a round canister that was 6" in diameter. They both have the same 6" outer dimension.
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Old 11-16-2011, 12:49 PM   #4
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Are the 'outside dimensions' of a rectangle the distance between the flat sides or across the diagonals?
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Old 11-16-2011, 12:51 PM   #5
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Flat sides. A piece of paper is 8.5"x11", not 13 7/8" (diagonal) or whatever.
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Old 11-16-2011, 12:55 PM   #6
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Then you should buy a fluval instead of a round canister. I'll buy a 11" diameter canister.

If you decide you want to use a square instead, that's fine too. Just be sure and read the claim.
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Old 11-16-2011, 05:44 PM   #7
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Well lets see... A cylinder that is 12" tall with a 6" circumfrence has a volume of approximately 339 cubic inches. A recantgular prism that is 6" wide on both sides and 12" tall has a volume of roughly 432 cubic inches. Thats an increase in volume of approximately 22%. Not exactly what they are claiming, but I think the principle still stands
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Old 11-16-2011, 06:04 PM   #8
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The fluval line of canister filters can arguably be considered some of the best in the industry. Not sure what you're getting at, but it seems like you might just be pointing out their under-impressive marketing? IMO, their reputation speaks for itself.
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Old 11-16-2011, 06:08 PM   #9
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I think it comes down to someone in marketing making statements that would appeal to the masses.

I wonder what the added capacity and addition of 90 degree angles does to their pump performance.... hmmm... j/k

Fluvals are very good filters. Several other brands are in the same high quality arena too though.
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Old 11-16-2011, 06:15 PM   #10
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I believe they are among the best as well. That why it bothers me that they resort to cheap marketing claims to encourage sales.

Is really so hard to be honest and sell a good product?
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