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Old 11-06-2017, 07:06 PM   #19
Comodave
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City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 2,668
I had always promoted shaking the extinguisher upside down to break up the powder. As a Vesel Examiner, we are now told not to recommend that. I don't know just when this occurred since I was inactive for quite a few years as a VE. But currently it is not recommended. They say there are anti caking chemicals added not to prevent it from happening.
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