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eheim confusion

Hi All,

    I love my Eheim filters, and am planning on purchasing another for a new
tank set up. My confusion stems from Eheims published specs for the 2226 and
2228 professional filters.

    The first is recommended for tanks to 92 gallons, output 251 gph, and
the second for tanks to 158 gallons at 277 gph. The 2228 has a larger
capacity for filter media, so I can understand their rating it suitable for
a larger tank. It's the flow rates that confuse me... I checked the parts
lists, and both filters use the same motor and pump assembly, consume the
same amount of power, will operate the same 6'7" head, and have the same
3/4" input and 1/2" output hoses. The dimensions of the cannister are even
the same, except the larger filter is taller. So how does the 2228 push 26
more gph? I would think that with more filter media to push through, the
larger filter would have LESS flow, not more.

    Am I missing something here, or have the fine folks at Eheim figured out
a way to manipulate the laws of physics?

puzzled in Perth,

Ron Barter