Yeah, it is a 581503. Its pretty quiet, actually. Not as quiet as my Eheim 1250, but the LG does have a cooling fan in the motor, so a little more noise is not unreasonable. As far as performance/flow rate differences between the two, its night and day. I'll update when I've had it running for a while. Just hooked it up a few hours ago.
--HP
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That which does not kill me had BETTER do enough damage to keep me from firing back!
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