sonic cleaner ???

[ThunderStruck]

I have a question about ultrasonic cleaners?
How often do you change the cleaning solution, also do I leave the solution in cleaner or clean it after each use...
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[Certaindeaf]

I'd leave it in the cleaner unless it's used only very rarely.
You're probably supposed to rinse the solvent off of the cleaned part so even if it had a lot of particulate on/in it, it would be rinsed off.
As to changing, I'm not a chemist, and it may well lose its effectiveness over time, but I'd strain it through a coffee filter occasionally and if it's terribly ganky, I'd use a cone paint strainer - they come in multiple grades of fineness - (get them at Miller paint etc. for like a dime ea).. change out the solvent when it no longer works satisfactorily.

 

[PX4WA]

if you use citric acid powder and some dawn soap, the cost per fill is less than a dollar (probably more like a quarter)... I change it when I can no longer see the bottom...

if you use the expensive stuff (why do you use the expensive stuff anyway)... then you can filter it...