I do not know about Crest. Elmasonic still makes a great machine.
There is a new one on the market called SharperTek 2.5-Liter. They
make all sizes. It is a US company that makes cleaners for the auto
industry. I like the 2.5 Liter cleaner for small shops.
It has a feature called ‘Sweep’ or MotuSweep. This setting causes
the tank to clean in a sweeping or a wave motion at the same time
delivering ultrasonic waves and will clean in every corner of the
It has power and is fast.
Rio Grande Technical support