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I imagine that every cannister filter is designed to work best when set to operate at more than 50% of its flow rate capability. If, for example, one had a large Eheim 2026 on a 30 US gallon aquarium, one would have to turn down the flow rate to 50% or less so that there was not too much turbulence in the tank. But if one had an Eheim 2222 on the same tank, one might well turn the flow rate up to 100%. With low flow rate, the water might not penetrate certain areas of the filter media. Higher flow rates would, presumably, push the water through much more of the filter media and, therefore, keep alive a larger bacterial colony. Both biological and fluid dynamics aspects of cannister filter technology suggest it is best to keep the flow rate above 50%.

Andrew Cribb
 
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