I talked with one of the Hydor reps at MACNA about these PHs. The really nice thing about them is that they have electronic circuitry that ensures that the prop will always start up spinning in the right direction. That means there's no problem with putting them on an on/off wavemaker switch (like my ReefKeeper 2). They also won't chatter at start-up like the ones with the mechanical stoppers sometimes do.
Acrodave - do you have any of these in yet? If so, which models?
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