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Re: Puzzled in Perth & NJ

Ron Barter <mistnfrost at superaje_com>
> Subject: 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 
Indeed, the 2226 use the same size hoses also.  If the 2228 had a
larger diameter media box, that would equate to less resistance but it
is the same diameter and taller than the 2226.  I am curious what Eheim
would give as the explanation.  Other things being equal, one would
expect the larger media container to need changing less often or to be
adequate for a larger tank, but not to pump more water with the same
pump.  Has the 2228 a different, more efficient pump?  Or is this just
another typo on the Eheim web sites?

In any event, wouldn't you prefer the later model 2026 (or 2028) over
the 2226 (or 2228) model?

Scott H.

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