https://youtu.be/Nv6nJz_8fSI
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One thing I found when I was selling our old high quality Branson cleaner is the transducers get weaker as they age. The guy buying mine had to test it for a while (during freezing clod weather here...burrrrr) and determined it still had enough power for his needs.
Thanks, something to be aware of.
https://sonicsoak.com/blogs/articles...asonic-cleaner.Maybe adding some chemicals to assist the process would have helped