This 1 micron cellulose cartridge filter is included with the non-HEPA vacuums and is preferably used for dry vacuuming. A cartridge filter must always be used to prevent motor damage and dust inhalation. After wet vacuuming, allow the cartridge filter to dry, or replace it with a dry cartridge filter. Dry vacuuming with a wet cartridge filter will ruin the filter.
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