Homebrew PCBs

I bought solid FeCl3, in small ball shape.
I add water to get pcb etching solution.

I found used FeCl3 solution will become 
two parts: green, transparent liquid and 
yellow solid at bottom.

As I understand, green solution should 
contain Cu ion from pcb. 

Could I pour out green liquid and add new 
tap water to renew etching liquid?





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