Bubbles well. However, they do begin to "shed" with moderate use and cleaning. There was some algae in my hydroponic tank so I also had to clean the air stone. Pieces kept falling off. After cleaning, I noticed that pieces of airstone fall into the tank every day. Considering they cost less than a dollar each, that's not the worst that could happen. However, I would really prefer that they didn't "spill" into my tank.
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