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Re: Which Eheim filter to buy
In a message dated 8/23/2000 00:57:21 Pacific Daylight Time,
Aquatic-Plants-Owner at actwin_com writes:
> The Eheim catalog shows The #2222 as having "pump output" of "apprx."
500
>
> liters/hour, and "filter circulation" of "apprx." 350 L/hr. I don't know
> if
> that second figure implies that the canister is charged with recommended
> quantities of Eheim media, or empty. I've been assuming that it means
with
> the media. The numbers for the #2224 are "apprx." 700, and 500 L/hr.,
> respectively.
>
Careful. The flow rate numbers published by filter manufacturers are rated
with an empty filter, no media, at zero head (no water lift). In the real
world, the actual flow rate drops significantly, as much as 75% with some
brands and models of filters. Eheim does give you credible rates with media,
but those numbers are printed on the box, not in catalog advertisements. As
an example, my Eheim 2217 is rated for 254 gph, or something like that, while
the box states the actual flow rate with media is 112 gph. Now, this is
perfectly adequate for any tank the filter is recommended for, and actual
experience backs this up: Eheim filters do a fantastic job of cleaning out
debris from the water, and keep it sparkling. But don't make the mistake of
comparing advertised rates of flow between one filter and another. Those
numbers are very deceptive, and can cause you to choose a filter based on
phony information. Not what you want to accomplish.