ajmckay Posted August 6, 2015 Share Posted August 6, 2015 So I've used this Bubble Magus NAC6 for 2-3 years with no issues. It's been quiet and works well. A little bit ago the original mesh wheel broke, but it came with a replacement so I snapped the new mesh wheel head onto the magnet and re-assembled the pump. The pump is quiet when I first plug it in - but it gets really LOUD when I attach the air intake line. Anyone know what this might be caused by? Seriously all I did was replace the impeller head and cleaned out the pump and venturi parts with a toothbrush and some diluted vinegar. Skip to 0:51 to hear the noise. By "self balance" I meant maybe the mesh needed a little bit to seat itself fully or something. Quote Link to comment
ajmckay Posted August 7, 2015 Author Share Posted August 7, 2015 I've never been so stumped over something that I thought would be a simple fix... I don't even know what to google because whenever I google words like "Protein skimmer loud venturi" I get information on how to add/make a silencer - but this isn't the same noise. This noise isn't just the sucking sound from the air intake tube it's air causing a noise closer to if not inside the pump! Quote Link to comment
ajmckay Posted August 8, 2015 Author Share Posted August 8, 2015 I'm still stumped - any ideas? Quote Link to comment
ajmckay Posted August 8, 2015 Author Share Posted August 8, 2015 Okay I really don't want to use this as an excuse to buy a new skimmer... Well I do - but I want a bunch of other stuff too... Quote Link to comment
tk-it-ez Posted August 15, 2015 Share Posted August 15, 2015 That is loud. Can you try removing the air hose and see what happens? Leave the venturi on just the air hose off. 1 Quote Link to comment
Rosem89 Posted March 28, 2019 Share Posted March 28, 2019 Just wondered if you ever figured out what was causing this I have a nac 7 doing exactly the same thing and can’t for the life of me figure out why? 1 Quote Link to comment
ajmckay Posted January 7, 2021 Author Share Posted January 7, 2021 Sorry this is reeeeeallllly late lol - but maybe it will be useful to someone. I ended up deciding that it was something related to the new impeller head. Something was off balance. I tried (not very hard) to find another for the Atman pump when I found a bubble magus "upgrade" kit. It came with a new Bubble Magus branded pump that had a pinwheel impeller instead. It also came with a new mounting baseplate, venturi nozzle, and diffuser plate. It was $75 I think so I just did that. I'm sure with some digging a new head for the atman pump could be found but this just seemed easier. Plus it made the skimmer work a lot better and is even quieter. Note that in 2021 I still use this skimmer. I like it and think it's pretty good performance in a relatively small package. 1 Quote Link to comment
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