Actually, I got the pump from Caswell's to test as part of another project. It is a mag-induction motor. It isn't a product that they carry and it was the only one he had. The test is still being conducted so I can't give out much more information, but I'm hoping to have it completed with the next 1-2 weeks. I think we finally conquered some of the hardware and equipment problems I've been having, at least I'll know for sure when UPS shows up tomorrow with replacements.
The 500 gph pump should be more than suitable for your setup. The Boyu 1300 pump, even though it is rated for 900lph, it has very little pressure (and if your familiar with pumps, it has a max. head height of less than 6'). What you have to be concerned with is the pressure and velocity of your output. The higher the pressure/velocity, the more likely you are to splash the electrolyte. Like fibergeek said previously, as long as the movement of electrolyte is sufficient to keep the hydrogen bubbles from sticking to your work piece, that's all you need.
As long as you are positive the drive shaft is stainless steel, then you won't have a problem. If you have the slightest doubt, use the 700 gph pump with the ceramic shaft. The electrolyte will have no effect on the stainless or ceramic shafts. But if there is a chance that the shaft is steel, then you would contaminate your electrolyte, not to mention dissolving the pump shaft.
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