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The Leitz TruSens Z-3000/3500 air purifier's replacement filter pack contains three activated carbon filters. They not only capture odours and gases, but they also offer the first level of defence against dust and pet hair.
You should replace this carbon layer on the DuPoint™ true HEPA drum filter. For best results, replace the carbon layer filter every 3 months. The change indicator light is displayed on the air purifier when the filter needs to be replaced.