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.