Firstly,  thanks to all for help with PICS!

I don't wish to add to the "noise" level but thought this would be an
interesting question for all the geniuses!

Can anybody help with information regarding "reforming" etching fluids so the
copper can be removed and the fluid re- used?
Good for the enviroment!
I normally use SodiumPersulphate, which is supplied to me in a white powder
form.

Also Ferric Chloride.

Are there any other etching liquids you can recommend?

Thanks in advance

Kev