I'd only recently heard of the use of electrolysis generating the ppm needed of hypochlorite to sanitize swimming pool water. In fact, it may have been on this forum, so you may have some success with a forum search. Your question is beyond me, however, its so specialized, you should get in touch with the manufacturer, or maybe ask on a forum dedicated to swimming pool care. Adding caustic soda does seem wrong however -- you can't really add enough, to make a difference, that would still be safe to swim in. Of course, the swimming pool needs pH control, but that's separate from your hypochloite generator's needs.