Great article comparing most of the high flow powerheads...

[Enigma]

Originally Posted by sphelps

This has been discussed before but it should be noted for those who want to use such articles to compare tunze and vortech. Vortechs produce turbulent flow which read higher on the measuring device used while tunze produces more laminar flow patterns. This is why you see vortechs producing more than advertised and tunzes less.

Had I known that when I purchased my Vortechs I would have purchased Tunzes. The turbulence the Vortechs generate is hard to compensate for.