Dave, thanks for the intro, but I'm not sure I qualify as 'one of the smart guys'.
Brock, I can only tell you from the 2 pools I've done that are indoor with SWGs, the problem lies in the other direction, the smallest SWG unit produes too much chlorine. The problem, as I've figured it, lies in the fact that, being inside, the pool gets neither the UV exposure, nor 'organics' that usually (continuously) enter an outdoor pool, which in turn, make up a substantial portion of the 'chlorine demand'. Even at the lowest setting (5% for the Goldline/Hayward units we install), 4 hours/ day of pump time results in ~5ppm chlorine - a lot more than is necessary - of course there's no cya in an indoor pool.
As I understand it, cell life is determined by run time (and voltage running through it ?) and @ 5% for 4 hrs/ day, I think these cells might be almost a 'lifetime' purchase. It does depend on pool usage though, if you had the entire 'BOYS SWEATING TEAM' in your indoor pool, actively practicing in your pool for 5 hours a day 7 days a week, you might have to turn the output up to 10% and run the pump for 6 hours/ day.
Poolsean, or Mark from Watermaid, may have more info on low cl output from their units (that just doesn't sound right), um... whether their companies products are capable of producing less chlorine for a noncommercial, indoor pool.
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