Homebrew PCBs

> An eBay search for:
> 
>   magnetic pump
> 
> produces hundreds of results, some of them for small pumps costing less
than
> $100.  Sorting by "price with shipping" groups similar products together.
> 
> Perhaps not every one of them has a magnetically coupled impeller -
thereby
> presumably having no metal shaft or seals which could be attacked the the
> etchant.  Maybe some of these are truly magnetically coupled, with an
impeller
> magnet totally sealed in plastic, and with enough pressure to drive spray
> nozzles.


I've got a couple of those that I paid $20 for
(http://www.ebay.com.au/itm/280877928450), mine are 24V @ 1A, and claim
12.5L/min.  The power rating is correct, I haven't checked the flow rate but
it does indeed pump water at a fair rate.  It didn't mention pressure, and I
haven't tried.  Presumably the same as another 24W pump.

They are also magnetically coupled, the impeller & shaft (with magnet) can
be removed, it has no metal.

I did read a bit of grumbling somewhere about how some type of acid would
attack the plastic and fail after a few weeks, I gathered this was the type
of pump they were talking about.  I'm only using water so that's not a
problem, I can't advise on reliability either.  I'm also running it in air,
not submerged.

Mine seems to match its advertising.

Tony