Refresh your work area with fresh Weller filters. The HEPA particle filter and the granulated gas filter are combined in such a way that they are replaced together as the main filter unit. Over time the HEPA filter becomes clogged and the gas medium is saturated and oxidized. The fine dust filter (pre-filter mat) represents the preliminary stage of the filtration and is typically replaced monthly depending on the application, whereby this filter set represents a convenient way to replace the main and pre-filters in an optimal ratio.
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