Sorry about the size of the file (3.5 MB) and that you need to download a SHARP audio codec to view it - I recorded it with my cruddy SHARP video camera
I injected bubbles into my aquarium return line so people could view the water turbulence. It didn't make my two lats too happy You can see the high alternating current. The big rush at the end of the video was not part of the setup - it was caused by a huge amount of air being sucked into the return...
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