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