I did a diy version of these. It does increase the flow but in order to increase it as much as it says, you'll
have to have a pump with a pretty high head pressure. It acts like a venturi, the water flows fast through
the center which creates a vacuum on the sides which pulls even more water through the nozzle. Personally,
I'd just get some powerheads or vortechs because the flow will be wider and less destructive with those.
JMHO
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