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Here is how they work.
I would verify with seller its 30L. In the pic it says 10L. If it works good and 30 L(approx 7 gallon) that is a great deal. I have one that works ok, but too small to drop a carb in it.
I have heard that some of the imports are junk, the transducer is the expensive part, and mine has 3 and I thought that was odd. I called Branson and talked to there tech guy and he explained to me how the 3 unit worked so much better than the 2 or 4 unit one because of the way the waves overlap and can cancel out the other ones.
It's been years since I used one, but the answer is yes. Very faint but the answer is yes, at least whith stuff in the unit. I hate to tell what we used for cleaning solution. This was clean room clean type work. Some good tips in these threads. Do NOT join Tapatalk. Just close the ad and read the thread. Solutions for ultrasonic Cleaning Carburetors "Deep roots" does a lot of carb resto work... Removing a stuck metering block Techniques Ultrasonic Cleaning - Fundamental Theory and Application Technique for Ultrasonic Cleaning with Volatile Solvents
Your not supposed to run them low on water but if you want to see it work put a couple inch's of water in it and turn it on for a second and look at the waves. You always want to use distilled water, The first time I was using it it got dirty fast so I changed it a lot then I started pre cleaning the junk off before I used the ultrasonic so the solution lasted longer. One day I took off the lid and the was some green thing growing in there! it was half the tank large blob. Then I started using distilled water and never had that problem again.
You hit on something possibly. We have really hard water here. That could be an issue.
Some deadly serious (and pricey!) stuff here, probably the closest thing to chloroform you can find. Engine Carburetor Shellac and Varnish Buster: Shellac-Buster