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Ping pong balls . . . Racket Balls
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. . . and also the plastic balls used in indoor play areas. I also suggested light weight wood in my article, which would be far more expensive, but possibly more theraputic.
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. . . but trying to maintain two layers would be nearly impossible as the top layer would want to push the lower layer aside so the top layer could come to the same plane as the lower level.
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Not if they are contained in the area of your tub.
I picture something heavier than a ping pong ball for control, two or more sizes to fill gaps, and two or more deep to finish off the "seal". As always I want to emphasize that rarely does one size fit all, and some ideas are more practical for some than for others. I am always simply hoping to help someone . . . not everyone.
I say hot tub rather than Jacuzzi since that is a brand name . . . like Kleenex.
Thanks for the feedback!