Homebrew PCBs

lothar baier wrote:
> tried that, didnt work, what workes is a pump like used in washers or dishwashers, they are normally fairly resistant to chemicals
> 
>

What parts didn't survive in the pump that you tried ?

I'd suspect dishwashers use stainless steel parts in contact with 
liquid. Alkaline dishwashing water wouldn't touch stainless steel. I'm 
pretty sure persulfates are ok with S.S, but forget ferric chloride.