Genuine Whirlpool® 8171433K Charcoal Pre-Filters (4-Pack) replace the pre-filter that comes in Whirlpool Whispure™ AP150 or AP250 air purifiers. The activated charcoal pre-filter reduces odors and captures larger airborne particles before they reach the HEPA filter. Change pre-filter every 3 months, depending on use. Package contains four (4) Pre-Filters – a one-year supply!
Please see Owner's Manual tab for full instructions on changing the pre-filter.
NOTE: Do NOT immerse the pre-filter in water - it is NOT washable.