I've never anodized before but if it's important to agitate the solution of sulfuric acid, I would be reluctant to use air to do it. I wouldn't want to create any kind of vapor to begin with and then I wouldn't want it being carried out into immediate area where it could cause problems. Breathing and corrosion and such. Is there some reason you couldn't use a motor driven polyethylene agitator? Just a thought...

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