Wong, I believe you will find your 6 hour process is the problem! We had found in early testing that with extensive runs we would easily form complex streamers and when they touched the glass container, a shiny silver plating (mirror) occurred . If that same glass was used again the mirror spot would grow even without the streamers! That was part of our reason to design our unit to fit into a gallon jug, so no one had to clean and maintain containers. The glass we use to do the initial meter calibration also grows mirror spots, even though it is never used over 5 minutes and then emptied and stored upside down until the next use. Time definitely works against producing fine particle size. Use part of your last batch to reduce the required run time! Do you have any idea what the PPM is? Send an ounce of Cs and water and we will test them for you free, to: PII, 3516 Delilah Drive, Cape Coral, FL 33993
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