I have an Aquamaxx EM300 if interested. Like new, was my backup due to being a bit large for my 150g, but still pulled skim hard.
It comes with an extra new impeller. The impeller in the pump looks new also.
I have made two modifications -
1. Plumbed airline into cup to pull moist air in to keep venturi clean, and put it up above the top line so that it does not pull in waste.
2. Added extra air nozzle to run ozone directly into the venturi. It is capped
off.
PM me if interested.