> > For agitation, can you just use an aquarium air pump?  Do you use a
> > diffuser?
>
>IIRC, you are in Austin, right?  Petco on Great Hills Tr. has a small
>aquarium
>pump called a Profile 1000 (or something like that).  <$10 and works well
>for
>me.  Very quiet too.  Not sure what you mean by diffuser, so I guess that
>answer is no :-)

I'm etching boards these days in a 1 gal aquarium that came from K-Mart
with an air pump and a diffuser.  Not a bad deal at $9!

A 25 W heater doesn't seem to be enough to heat the solution up
too much.  I guess I may try a larger one, but it works well enough at
room temp for me not to be too worried.

Incidentally, I'm using sodium persulphate for etching.  Does anyone know
anything about its toxicity compared to Ferric chloride?  It seems more
benign
to me; right now I have it in a fume hood but would like to move it out.  Is
that a bad idea?  I won't do it if anyone has any negative input on that
idea.

Mike H.

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