Whirlpool filters should be replaced whenever the filter change indicator on the air purifiers lets you know the filter needs to be replaced, generally every 3 months for the pre-filter and yearly for the HEPA filter with continual use. Replacing your Whirlpool filter is an easy and inexpensive way to keep your Whirlpool air purifier performing its best.
http://www.achooallergy.com/whirlpool-filters.asp
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