11-18-2009, 12:24 PM
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When filter flow decreases, the first thing to do is clean it by rinsing the pads and media. At the same time, check that the water path is as it should be, not being blocked by media. Start it up and see.
I am not sure of the exact model, but some Eheims have a flow regulator, it might have been reduced without knowing.
Also, age may impact it, though Eheims are well made filters.
If the above doesn't resolve the flow, let us know; I'm sure someone here has experience with this model. My Eheims are more than 12 years old, and still running without a hitch.