all scientific stuff is incredibly pricey! If I were back in a lab, I'd guess the tube I described could cost close to $300 from a lab supply house.
And searching extensively... I can't find anything but stones bubblers when it comes to aquarium suppliers these days. And my guess that those would disintegrate was confirmed by someone's actual experience, so I'd avoid those. I see now I should have looked before assuming aquarium stores carry the same things today as the one I bought my tube in 30 years ago.
Since we're PCB making types, I'd guess we all have small enough drills to put some holes in a rigid plastic tube so it puts out fairly small bubbles... as someone else already suggested. No doubt that will get the job done, tho more slowly. Then again, we only need to etch occasionally so maybe just use a straight piece of tubing that reaches the bottom of the container. What's the rush when it comes to regeneration? None here since I haven't etched anything in maybe 6 months.
Jim H
Received from Dave at 3/23/2019 11:33 PM UTC:
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Hi Jim,
Ok, I will see if the local shops know of them. I already found them under "gas dispersion tubes" too online but those scientific ones are pricey. Iam sure I will hunt one down...
Thanks,
Dave
