Homebrew PCBs

Matthew Smith wrote:
> Quoth Mark Brueggemann at 2008-04-29 22:55...
> 
>> I had one for a while but couldn't find a pump that would 
>> put up with the etchant (ammonium persulfate).  Whatever the
>> answer is, the agitator or impeller needs to be isolated 
>> from the drive source, and ideally it fits into a variety
>> of tank sizes and shapes to accomodate one's varied applications.
> 
> You want either a magnetic drive pump (polypropylene would probably be a 
> suitable material) or a peristaltic pump (actually a positive 
> displacement pump - a set of lobes on a rotor squeeze a plastic tube to 
> push the fluid along.)
> 
> Hae a look on eBay - you'd be amazed at what's out there.  Or probably 
> you wouldn't - I never cease to be amazed though, even after my wife 
> bought a grand piano through there...
> 

Its been mentioned before but a aquarium pump suitable for saltwater 
should fit the bill. All are aquarium pumps are mag drive, but saltwater 
pumps won't use a stainless steel shaft.
One of these might make a good 'water fall' etcher being discussed here.

Adam