Great article comparing most of the high flow powerheads...
http://www.advancedaquarist.com/2011/7/aafeature
Interesting to see the actual measured flow rates vs manufacturer's claims as well as efficiency ratings (flow gph/watt of power used). Testers measured actual flow, wattage used, etc. and compared these to what manufacturers are claiming for Tunze, Vortechs, Hydor Koralia, Maxijet1200s, Aqueon & Coralife powerheads.
Anthony
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