242 Maintaining Your GC
12 Maintaining the FPD
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5 To prevent light from damaging the PMT, cap the end or place 
it face down.
6 Place a clean cloth under the filter housing to catch the filter.
• For phosphorus filter, use the sharpened wooden tip of a 
toothpick or cotton swab to dislodge the filter from the 
housing.
• For sulfur filter (shown below), use the wooden tip of the 
cotton swab to remove the filter spacer. Then dislodge the 
filter from the housing.