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The Eheim 2217 is the largest of the Classic series you can buy. It's rated at 264 gallons per hour and the filter itself is a hefty 6 liters (roughly 1.5 gallons). This is significant because the volume of the filter container determines how much media you can put in and the more media, the more filtering capacity. Many people mistakenly think that the flow is what determines what size tank a filter can handle. Although this holds true in some cases, larger filter volume will always mean larger filtering capacity. It doesn't matter how fast you push water through a tiny container, it will only have so much media that can do the job. Although the 159 gallon rating may be a bit optimistic (like the 2213's 66 gallon rating), this filter can certainly get the job done on any tank below its upper limit.
If anyone asks you why an Eheim is one of the best filters available today, you can point to the flawless German engineering and efficiency. The 2217 only uses 20 watts to push all that flow; comparable filters use 25 or more. There is also absolutely no bypass. The way the filter is designed means that all water must pass through the media. Any dirt that gets sucked up by this filter remains in the filter.
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Eheims are probably the best filters you can buy, if you have the money. The 2217 usually retails for around $150 but is well worth it, as these filters have been known to last for decades. I give it five out of five fish:
Pros: Efficient, high quality, no bypass, large filtration capacity
Cons: First time priming can leave a fishy taste in your mouth
Buy the Eheim Classic Canister 2217 now at Drs. Foster & Smith.