3) Our original tests were done using gravity alone to purge the PF-2™
elements. Since then, we have added a step by using purging buttons which
are much more efficient at removing any residual process dust from the
PF-2™ media. The test does not distinguish between activated alumina
(Al2O3) and Aluminum (Al). So we had to use the total count of aluminum
and activated alumina in our tests.
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