Well Anton (ATB Austria) has his own cnc machines so its not to hard for him to make us impellers. I guess eheim does not sell only the needlewheel impeller in the EU. Both impellers are the same size the way ATB does the impeller it wouldn't be that much to get a disc for mesh mod. The magnet is what is costly. Yes I am going to replace all the Nanos with needlewheel impellers I think this will solve our microbubbles. The air we are hoping to be at 500-550 tests are still being performed.
Thank you
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