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• The potassium permanganate (KMnO4) filters change color from bright purple to dark brown with the
amount of exposure. To check this please remove a used filter per section 7.1.1 above.
• Pry open the corner of the filter and dump out some pellets for examination.
• To determine if the potassium permanganate has been exhausted remove a pellet and cut it in half.
• With the pellet on a white paper towel add a few drops of water to the pellet. The water running off the
pellet should be purple and then turn a deep iodine color.
• The filter should be considered 80% used when the purple color diminishes from the core of the pellet
and 100% depleted if there is no color present.
use this pellet examination method only in typical laboratory conditions. Highly concentrated
solutions or excessive formalin pouring operations will prematurely deplete the pellets and give a false sense of
filter life.
7.1.3 Health Hazard information & Disposing of Filters
Health Hazard Data - Alumina Permanganate Filter Media
• Effects of Exposure – The filter media is non-toxic upon oral, skin, and inhalation exposure and is non-
irritant to the skin. Breathing dust may cause sneezing. The skin may feel dry after contact. The filter
media is an eye irritant.
• Emergency Treatment – Flush eyes with large quantities of water and seek medical attention.
Filter Disposal - Dispose of contaminated filters per your facility, state, and federal procedures for hazardous
materials disposal. See the SDS for the chemicals exposed to the filters for further directions.
7.1.4 Changing the in-duct filters on 2024 Models.
• The Filter is seated inside the front grill. Remove all accessories from the hinged grill. Accessories on the
upper pegboard are not required to be removed in this process and may stay attached. On either side of
the hinged grill will be two thumb screws that are to be removed by hand. Once the fasteners are
removed the hinge can be lifted giving access to the filter carrier. Pull the filter out and dispose of the
used filter. Vacuum any debris in the filter carrier with a vacuum attachment and replace it with a new
filter.
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