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Originally Posted by peterprv
How long should I expect the zinc (copy cad) solution to last before it's diluted? Is it ok to add fresh water to the tank to maintain the correct level?
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The electrolyte itself should last indefinitely. It does not wear out or "expire" w/age.
If your liquid level is dropping due to evaporation, then yes, you can top it off w/more water.
But if your liquid level is dropping due to "dragout" (electrolyte remaining on the parts when you remove them), that needs to be replenished w/fresh solution.
Let your parts drain off well over the tank before going to rinse, and you won't lose much at all.
Sean