Title: My favorite air filter - AP510
Product review: This filter works great in my Whispure AP510. I've used many air filters and the AP510 unit is my favorite... well built and well designed. Too bad there is no carbon filter (not a pre-filter but a "heavy duty" carbon filter); I believe it was discontinued).Interesting note I found on the web - "The Whirlpool air cleaners have been in short supply and subject to significant retail price markup during 2009. Production is set to resume in the spring of 2010."Compared to the cost of other high-quality air filters, I think the filter costs are reasonable and am glad I can buy them on Amazon.
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