Remaining Service Life



The key to successful air filtration is replacing the media prior to having any issues such as corrosion, hazardous vapors, or foul odors.

Hydrosil can help keep your system in healthy service by testing your gas phase media in your filter. If the media is not changed out when need your system will function improperly. The percentage of available permanganate and the density of the gas phase media can be correlated to the active service life left in the product.  If the media in the adsorber is Hydrosil HS-600 or an activated alumina based product, the following schedule can be followed:

(% by Weight Active Chemical)
Activated Alumina
(% by Weight Active Chemical)
2.2 to 6.0 Safe 2.6 to 8.0
1.6 to 2.2 Borderline 1.9 to 2.6
1.2 to 1.6 Change 1.4 to 1.9
0.0 to 1.2 Change Immediately  0.0 to 1.4


The comments mean the following:

Safe— Reanalyze in 90 days

Borderline— Change in 30-90 days

Change— Change in 30 days, breakthrough could occur quickly under plant “spill” conditions

Change Immediately— Change Immediately

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