Ken, and all,
  It is looking like I have found the problem, but I won't be 100% certain 
until I have run a few more batches......
It is seems very likely that the problem is indeed a contaminant, and that the 
contaminant(s) are the spray kitchen cleaners I use--1 spray bottle of peroxide 
and 1 of white vinegar. I use these many times per day to clean counters, stove 
top, sink, etc.  and absolutely never gave it a thought.....since stopping that 
I have now made  3 perfectly clear batches, one in the Silvergen and 2 in the 
Silverpuppy......
  Both generators are *closed* very well in operation, so it never occurred to 
me that contamination could happen with my sprays.......however, looking round 
the kitchen, I see that overspray could easily have also been getting onto the 
paper towels I use to wipe electrodes.........and how long spray mist particles 
can stay suspended in air, I have no idea.......
  If the problem really is this simple, I'm going to gag over all the time I've 
spent beating my head against the wall.......But Trem says it could very well 
be the vinegar........
paula

  ----- Original Message ----- 
  From: Ode Coyote 

    When a thousand people use the same generator and 2 or 3 people make a CS
  that goes yellow over a period of time and not entirely consistantly at
  that...I think there may be some other factor at work.