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Q:What color should the inner core of a K00339 filter look like
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A:The inside is typically a charcoal gray color. If you are worried that your filter does not look right feel free to snap a picture and attach it to another question. I can have our sales team evaluate the color and let you know if you need to change the filter or have your machine looked at. You can also call us at 1.888.388.6372 for immediate assistance.
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