I dunno about that site... I've noticed quite a few things that they hype, and flat out over "spin"... Notice their PWM page:
http://www.dc-hybrids.com/category-s/17.htm
At the bottom it goes into a bunch of BS about how THEIR PWM does this and that... noteably how it is "forming a higher number of Orthohydrogen and Parahydrogen molecules." Whooooaaaaa - sounds super duper high tech!
Orthohydrogen and Parahydrogen are just isomers of regular old H2. In nature, they occur in a ratio of 75% Ortho("same electron spin"), and 25% Parahydrogen("different electron spin"). Basically what that means, is that ortho has both of it's electrons, from each hydrogen atom, with the same spin, while Para has opposite spins. It really means absolutely zero. The reason they are in 75% and 25% is basic probability... If you throw two coins up in the air, you have a 75% chance that they will both land with the SAME face up, but 25% of the time they will have different faces up. Try it.
Anyway, this is extremely off topic, but that site you referenced looks a bit like a scam site, trying to lure in new people that don't know too much about HHO. On top of their blatent BS, the prices are insane... my $0.02 for what it's worth.
EDIT: Larry, I agree with 100% of your post. I have never understood why people do that with the electrolyte. It's like controlling the speed of your car by mashing down on the gas, and applying pressure to the break to keep from going 120mph... And then they complain that their cell is getting hot! Yeah, no **** Sherlock... LOL