During pre-use inspections, workers at Oak Ridge discovered that End of Service Life Indicator on new air-purifying cartridges were not the expected yellow color, but varying shades of brown. This browner color is typically an indicator that the cartridge is depleted. The manufacturer has indicated that this issue is with the indicator changing color prematurely and not with the cartridge media. Since the discovery at Oak Ridge, two Hanford contractors discovered a number of anomalous air-purifying cartridges in stock and removed them from service.
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